1.
Which of the following will contribute to the cell theory?
I.
Living organisms are composed of cells.
II.
All cells come from pre-existing cells by mitosis.
III.
Cells are the smallest units of life.
A.
I only
B.
II only
C.
I and III only
D.
I, II and III
(Total 1 mark)
2.
A red blood cell is 8 μm in diameter. If drawn 100 times larger than its actual size, what diameter
will the drawing be in mm?
A.
0.08 mm
B.
0.8 mm
C.
8 mm
D.
80 mm
(Total 1 mark)
3.
A cell has cytoplasm, a cell wall, naked DNA and ribosomes. Based on this information, what
type of cell could this be?
A.
A cell from a pine tree
B.
A grasshopper cell
C.
A human red blood cell
D.
A bacterium
(Total 1 mark)
IB Questionbank Biology
1
4.
What do diffusion and osmosis have in common?
A.
They only happen in living cells.
B.
They require transport proteins in the membrane.
C.
They are passive transport mechanisms.
D.
Net movement of substances is against the concentration gradient.
(Total 1 mark)
5.
The diagram below shows a cell during mitosis.
What are the structures and stage of mitosis?
Stage of mitosis
Structure I
Structure II
A.
metaphase
chromatid
nuclear membrane
B.
anaphase
centromere
plasma membrane
C.
anaphase
chromatid
nuclear membrane
D.
metaphase
centromere
plasma membrane
(Total 1 mark)
IB Questionbank Biology
2
6.
Which of the following characteristics found in a structure necessarily indicates that it is alive?
A.
The presence of genetic material
B.
The presence of a lipid bilayer
C.
Metabolism
D.
Movement
(Total 1 mark)
7.
Which of the following does not occur during interphase?
A.
Replication
B.
Translation
C.
Cytokinesis
D.
An increase in the number of mitochondria
(Total 1 mark)
8.
Which pair of features is correct for both a human liver cell and an Escherichia coli cell?
Human liver cell
Escherichia coli cell
A.
contains DNA associated with protein
contains naked DNA
B.
has 70S ribosomes
has 80S ribosomes
C.
contains mitochondria
contains mitochondria
D.
contains DNA enclosed by a membrane
contains DNA associated with protein
(Total 1 mark)
IB Questionbank Biology
3
9.
If a mitochondrion has a length of 5 µm and a student’s drawing of the mitochondrion is 10 mm,
what is the magnification of the drawing?
A.
×0.0005
B.
×0.5
C.
×200
D.
×2000
(Total 1 mark)
10.
PanI is a gene in cod fish that codes for an integral membrane protein called pantophysin.
Two alleles of the gene, PanIA and PanIB, code for versions of pantophysin, that differ by four
amino acids in one region of the protein. Samples of cod fish were collected from 23 locations in
the north Atlantic and were tested to find the proportions of PanIA and PanIB alleles in each
population. The results are shown in pie charts, numbered 1–23, on the map below. The
proportions of alleles in a population are called the allele frequencies. The frequency of an allele
can vary from 0.0 to 1.0. The light grey sectors of the pie charts show the allele frequency of
PanIA and the black sectors show the allele frequency of PanIB.
[RAJ Case et al. 2005. “Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE
Atlantic cod Gadus morhua.” MEPS. Vol 301. Pp 267–278. Figs 1 and 3.]
(a)
(i)
State the two populations with the highest PanIB allele frequencies.
...........................................................................................................................
IB Questionbank Biology
4
(1)
(ii)
State the population in which the allele frequencies were closest to 0.5.
...........................................................................................................................
(1)
(b)
Deduce the allele frequencies of a population in which half of the cod fish had the genotype
PanIA PanIA, and half had the genotype PanIA PanIB.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(1)
The graphs below show the latitude and the mean surface sea temperature in June of the sampling
locations and the frequency of the PanIA allele.
[RAJ Case et al. 2005. “Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE
Atlantic cod Gadus morhua.” MEPS. Vol 301. Pp 267–278. Figs 1 and 3.]
IB Questionbank Biology
5
(c)
State the relationship between
(i)
latitude and the frequency of the PanIA allele.
...........................................................................................................................
...........................................................................................................................
(1)
(ii)
mean surface sea temperature in June and the frequency of the PanIA allele.
...........................................................................................................................
...........................................................................................................................
(1)
(d)
Suggest how natural selection could have caused the relationships shown in the graphs.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
(e)
The sites close to Iceland, at a latitude of 60–65°, had very varied allele frequencies, with
both PanIA and PanIB occurring. The water at these sample sites was highly stratified, with
much warmer water at the surface and much colder water below. Suggest reasons for both
PanIA and PanIB alleles occurring at these sites.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
IB Questionbank Biology
6
(f)
Using the data in this question, predict the effects of global warming on cod fish
populations.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
(Total 11 marks)
11.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Escherichia coli is a unicellular organism, so each cell must carry out all of the processes
required for life. Outline the functions of each of the structures in the cells of Escherichia
coli.
(9)
(b)
Compare the use of carbohydrates and lipids in energy storage.
(4)
(c)
Compare how pyruvate is used in human cells when oxygen is available and when oxygen
is not available.
(5)
(Total 20 marks)
IB Questionbank Biology
7
12.
The electron micrograph below shows the ultrastructure of part of an animal cell.
[Source: Reproduced with the kind permission of the Electron Microscopy Facility, Trinity College, Hartford,
Connecticut, USA, and Professor Daniel G. Blackburn.]
(a)
Identify the structure labelled I.
......................................................................................................................................
(1)
(b)
Explain briefly how materials produced in the structure labelled I are transported to the
plasma membrane.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
IB Questionbank Biology
8
(c)
Outline the function of the mitochondria in the cell.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
(d)
Suggest why the two labelled mitochondria are different shapes in the micrograph.
......................................................................................................................................
(1)
(Total 6 marks)
13.
The electron micrograph below shows an organelle in a eukaryotic cell. What is the area labelled
X and what is the type of reaction occurring there?
[Source: http://scienceblogs.com/clock/2006/11/cell_structure.php]
X
Reaction
A.
matrix
photolysis
B.
stroma
Krebs cycle
C.
stroma
photolysis
D.
matrix
Krebs cycle
(Total 1 mark)
IB Questionbank Biology
9
14.
In which of the following cells can more than one nucleus be found?
A.
An unfertilized egg
B.
Neuron
C.
Sertoli cell
D.
Muscle fibre
(Total 1 mark)
15.
Which of the following does not occur during interphase?
A.
Replication
B.
Translation
C.
Cytokinesis
D.
An increase in the number of mitochondria
(Total 1 mark)
IB Questionbank Biology
10
16.
This question refers to the following micrograph of a liver cell.
In which organelle does the production of ATP, due to chemiosmosis, occur?
A.
A
B.
B
C.
C
D.
D
(Total 1 mark)
IB Questionbank Biology
11
17.
This question refers to the following micrograph of a liver cell.
Structure X is the Golgi apparatus. What process occurs in this organelle?
A.
Post-transcriptional modification of mRNA
B.
Translation
C.
mRNA production
D.
Vesicle formation
(Total 1 mark)
IB Questionbank Biology
12
18.
The micrograph below shows an adult human stem cell.
[© Science Photo Library. Used with permission.]
(a)
The cell cycle can be divided into two parts: interphase and mitosis.
(i)
Identify, with a reason, whether the stem cell in the micrograph is in interphase or
mitosis.
...........................................................................................................................
...........................................................................................................................
(1)
(ii)
Deduce two processes that occur in human cells during this part of the cell cycle, but
not during the other part.
1. .......................................................................................................................
2. .......................................................................................................................
(2)
(b)
State two characteristics of stem cells that can be used to distinguish them from other body
cells.
1. ..................................................................................................................................
2. ..................................................................................................................................
(2)
IB Questionbank Biology
13
(c)
Outline one therapeutic use of stem cells.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(3)
(Total 8 marks)
19.
Which functions of life are found in all unicellular organisms?
A.
growth, response and nutrition
B.
differentiation, response and nutrition
C.
metabolism, meiosis and homeostasis
D.
growth, metabolism and differentiation
(Total 1 mark)
20.
Which statement is part of the cell theory?
A.
Cells are composed of organic molecules.
B.
Cells have DNA as their genetic material.
C.
Cells have cytoplasm surrounded by a membrane.
D.
Cells come from pre-existing cells.
(Total 1 mark)
IB Questionbank Biology
14
21.
Which of the following are features of prokaryotes and eukaryotes?
70S ribosomes
80S ribosomes
Naked DNA
DNA associated
with proteins
A.
prokaryote
eukaryote
prokaryote
eukaryote
B.
eukaryote
prokaryote
eukaryote
prokaryote
C.
eukaryote
prokaryote
prokaryote
eukaryote
D.
prokaryote
eukaryote
eukaryote
prokaryote
(Total 1 mark)
22.
What route is used to export proteins from the cell?
A.
Golgi apparatus → rough endoplasmic reticulum → plasma membrane
B.
Rough endoplasmic reticulum → Golgi apparatus → plasma membrane
C.
Golgi apparatus → lysosome → rough endoplasmic reticulum
D.
Rough endoplasmic reticulum → lysosome → Golgi apparatus
(Total 1 mark)
23.
Which events occur during the G1 phase and S phase of the cell cycle?
G1 phase
S phase
A.
DNA replicates
cell grows
B.
mitosis begins
cell divides
C.
cell divides
mitosis begins
D.
cell grows
DNA replicates
(Total 1 mark)
IB Questionbank Biology
15
X24.
In a cell, what is the effect of a large surface area to volume ratio?
A.
Slower rate of exchange of waste materials
B.
Faster heat loss
C.
Faster rate of mitosis
D.
Slower intake of food
(Total 1 mark)
25.
How can cells in a multicellular organism differentiate?
A.
They express some of their genes but not others.
B.
They all have a different genetic composition.
C.
Different cells contain a different set of chromosomes.
D.
Different cells do not have some of the genes.
(Total 1 mark)
IB Questionbank Biology
16
26.
The diagram below shows a bacterium.
What structure does the part labelled X identify?
A.
Nucleus
B.
Nucleoid
C.
Nucleolus
D.
Nuclear membrane
(Total 1 mark)
27.
What do prokaryotic cells have that eukaryotic cells do not?
A.
Mitochondria
B.
70S ribosomes
C.
Histones
D.
Internal membranes
(Total 1 mark)
IB Questionbank Biology
17
28.
What happens during the G2 stage of interphase?
A.
Homologous chromosomes pair
B.
Synthesis of proteins
C.
Homologous chromosomes separate
D.
Replication of DNA
(Total 1 mark)
29.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Explain why DNA must be replicated before mitosis and the role of helicase in DNA
replication.
(4)
(b)
Explain how the base sequence of DNA is conserved during replication.
(5)
(c)
Describe the events that occur during mitosis.
(9)
(Total 20 marks)
30.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Plants are a diverse group of eukaryotic organisms. Describe the different characteristics of
the bryophyta, filicinophyta, coniferophyta and angiospermophyta.
(9)
(b)
Plants store carbohydrate in the form of starch. Explain the reasons for starch being
digested by the human digestive system.
(4)
(c)
Compare the structure of prokaryotic and eukaryotic cells.
(5)
(Total 20 marks)
IB Questionbank Biology
18
31.
(a)
Outline the bonding between DNA nucleotides.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
(b)
Explain how chemical bonding between water molecules makes water a valuable coolant in
living organisms.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
(c)
Describe the movement of water across membranes.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
(d)
State the role of water in photosynthesis.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
(Total 8 marks)
32.
Up to two additional marks are available for the construction of your answers.
(2)
IB Questionbank Biology
19
(a)
Compare simple diffusion with facilitated diffusion as mechanisms to transport solutes
across membranes.
(5)
(b)
Describe the process of endocytosis.
(5)
(c)
Explain how an impulse passes along the membrane of a neuron.
(8)
(Total 20 marks)
33.
Which of the following take(s) place during either interphase or mitosis in animal cells?
I.
Re-formation of nuclear membranes
II.
Pairing of homologous chromosomes
III.
DNA replication
A.
I only
B.
I and II only
C.
II and III only
D.
I and III only
(Total 1 mark)
IB Questionbank Biology
20
34.
What is the function of the cytoplasmic (plasma) membrane of this bacterium?
A.
To produce ADP
B.
To form the only protective layer preventing damage from outside
C.
To control entry and exit of substances
D.
To synthesize proteins
(Total 1 mark)
35.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Eukaryotic cells have intracellular and extracellular components. State the functions of one
named extracellular component.
(4)
(b)
Outline, with an example, the process of exocytosis.
(5)
(c)
Translation occurs in living cells. Explain how translation is carried out, from the initiation
stage onwards.
(9)
(Total 20 marks)
IB Questionbank Biology
21
36.
(a)
The scanning electron micrograph below shows the surface of the nuclear envelope with
numerous nuclear pores.
[Source: adapted from D Nelson and M Cox, (2000), Lehninger Principles of Biochemistry, third edition, page 35]
(i)
Calculate the power of magnification of the image.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(1)
(ii)
State the diameter of the pore labelled X.
...........................................................................................................................
(1)
(b)
List two examples of how human life depends on mitosis.
......................................................................................................................................
......................................................................................................................................
(1)
IB Questionbank Biology
22
(c)
Describe the importance of stem cells in differentiation.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(3)
(d)
The graphs below show the normal menstrual cycle.
[Source: adapted from www.mivf.com.au/ivf/infertility/images/cyclediagram.GIF]
(i)
Predict, with a reason, how the graphs will change if the woman becomes pregnant.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
IB Questionbank Biology
23
(ii)
List two roles of testosterone in males.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(1)
(Total 9 marks)
37.
What is the sequence of stages during the cell cycle?
A.
G1
B.
mitosis →
C.
G1
D.
G1
→
S
G1
→
→
G2
G2
→
mitosis
→ cytokinesis →
→
G2
→
S
→
mitosis
→
G2
→ mitosis → cytokinesis →
→ cytokinesis
S
→ cytokinesis
S
(Total 1 mark)
38.
What is the difference between the structure of all prokaryotes and all eukaryotes?
Prokaryotes
Eukaryotes
A.
cell wall
no cell wall
B.
chloroplasts
no chloroplasts
C.
flagellum
no flagellum
D.
nucleoid
nuclear envelope
(Total 1 mark)
IB Questionbank Biology
24
39.
What does facilitated diffusion across a cell membrane require?
A pore protein
ATP
A concentration gradient
A.
yes
no
no
B.
no
no
yes
C.
yes
no
yes
D.
no
yes
no
(Total 1 mark)
40.
The graph below represents the amount of DNA during the cell cycle. Which part of the graph
represents metaphase?
(Total 1 mark)
IB Questionbank Biology
25
41.
The following sequence of pictures, made using an electronic imaging technique, shows a cell
undergoing division.
[Adapted by permission from Macmillan Publishers Ltd, Fuller, B G et al. 2008. “Midzone activation of aurora B in
anaphase produces an intracellular phosphorylation gradient”. Nature. Vol 453.]
(a)
State the stage of mitosis typified by image II.
......................................................................................................................................
(1)
(b)
List two processes that involve mitosis.
......................................................................................................................................
......................................................................................................................................
(2)
(c)
State the process that results in tumour (cancer) formation or development.
......................................................................................................................................
(1)
IB Questionbank Biology
26
(d)
Explain, using one example, how non-disjunction in meiosis can lead to changes in
chromosome number.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
(Total 6 marks)
42.
When observing the behaviour of a vesicle in a cell, what identifies it as a vesicle only involved in
exocytosis?
A.
Adhesion between two lipid bilayers
B.
Fusion of two membranes
C.
Secretion of material
D.
Invagination of a plasma membrane
(Total 1 mark)
43.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Draw a labelled diagram of the ultrastructure of Escherichia coli as an example of a
prokaryote.
(4)
(b)
Describe the events that occur in the four phases of mitosis in animals.
(6)
(c)
Explain the process of aerobic cell respiration after glycolysis has occurred.
(8)
(Total 20 marks)
IB Questionbank Biology
27
44.
How does the surface area to volume ratio change with an increase in cell size?
(Total 1 mark)
45.
How do prokaryotic cells divide?
A.
By mitosis
B.
By meiosis
C.
By budding
D.
By binary fission
(Total 1 mark)
IB Questionbank Biology
28
46.
What can the extracellular matrix of cells be made of?
I.
Polysaccharide
II.
Glycoprotein
III.
Phospholipid
A.
I only
B.
I and II only
C.
II and III only
D.
I, II and III
(Total 1 mark)
47.
During which phase of the cell cycle do chromosomes duplicate?
A.
G1
B.
S
C.
G2
D.
Mitosis
(Total 1 mark)
48.
What is the difference between simple diffusion and facilitated diffusion?
Simple diffusion
Facilitated diffusion
A.
Rate decreases with increasing
concentration gradient
Rate increases with increasing
concentration gradient
B.
Faster movement of molecules
Slower movement of molecules
C.
Always involves a membrane
Never involves a membrane
D.
Uses any part of a membrane
Uses channels in the membrane
(Total 1 mark)
IB Questionbank Biology
29
49.
Which of these processes require mitosis?
A.
Embryological development
B.
Reducing surface area to volume ratio
C.
Maintaining cell size
D.
Cell growth
(Total 1 mark)
50.
Which of the following structures are found in all cells?
A.
Mitochondria
B.
Cell walls
C.
Chloroplasts
D.
Ribosomes
(Total 1 mark)
51.
By what process do most bacteria divide?
A.
Mitosis
B.
Meiosis
C.
Conjugation
D.
Binary fission
(Total 1 mark)
IB Questionbank Biology
30
52.
Below is a micrograph of an E. coli bacterium undergoing reproduction.
[Source: www.bio.mtu.edu/campbell/prokaryo.htm]
The scale bar represents 0.5 μm. How long are both cells in total?
A.
5.0 × 10–6 m
B.
5.0 × 10–9 m
C.
2.5 × 10–6 m
D.
2.5 × 10–9 m
(Total 1 mark)
IB Questionbank Biology
31
53.
Below is a micrograph of an E. coli bacterium undergoing reproduction.
[Source: www.bio.mtu.edu/campbell/prokaryo.htm]
In the diagram what does label X identify?
A.
Nucleoid region
B.
Chromatin
C.
Histones
D.
Endoplasmic reticulum
(Total 1 mark)
IB Questionbank Biology
32
54.
The diagram below shows a plasma membrane. What is molecule X?
A.
Cholesterol
B.
Peripheral protein
C.
Glycoprotein
D.
Polar amino acid
(Total 1 mark)
55.
What is a difference between a cell in the G1 phase and a cell in the G2 phase of the cell cycle?
A.
A cell in the G2 phase would be smaller than a cell in the G1 phase.
B.
A cell in the G2 phase would have more mitochondria than a cell in the G1 phase.
C.
A cell in the G1 phase would have more DNA in its chromosomes than a cell in the G2
phase.
D.
DNA replication occurs in the G1 phase but not in the G2 phase.
(Total 1 mark)
IB Questionbank Biology
33
56.
The electron micrograph below shows an E. coli cell.
[Source: www.microbiology.umaryland.edu/images/bact_em.jpg]
(a)
Identify the structures labelled A and B in the electron micrograph above and state one
function of each.
A:
B:
Name
.......................................................................................................
Function
.......................................................................................................
Name
.......................................................................................................
Function
.......................................................................................................
(2)
(b)
Compare prokaryotic and eukaryotic cells.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(3)
(Total 5 marks)
57.
Up to two additional marks are available for the construction of your answers.
(2)
IB Questionbank Biology
34
(a)
Draw a labelled diagram to show the structure of a membrane.
(5)
(b)
Outline how vesicles are used to transport materials secreted by a cell.
(6)
(c)
Explain how the structure of a villus in the small intestine is related to its function.
(7)
(Total 20 marks)
58.
(a)
State the property of stem cells that makes them useful in medical treatment.
......................................................................................................................................
......................................................................................................................................
(1)
(b)
Explain how multicellular organisms develop specialized tissues.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
IB Questionbank Biology
35
(c)
Outline some of the outcomes of the sequencing of the human genome.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(3)
(Total 6 marks)
59.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Draw a labelled diagram showing the ultrastructure of a typical prokaryote.
(4)
(b)
Outline how three different environmental conditions can affect the rate of photosynthesis
in plants.
(6)
(c)
Explain how the emission of gases, both naturally and through human activity, can alter the
surface temperature of the Earth.
(8)
(Total 20 marks)
IB Questionbank Biology
36
60.
Which of the following is not a function performed by a membrane protein?
A.
Hormone binding sites
B.
Cell adhesion
C.
Enzyme synthesis
D.
Pumps for active transport
(Total 1 mark)
61.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Draw a labelled diagram showing the ultra-structure of a liver cell.
(4)
(b)
Distinguish between prokaryotic cells and eukaryotic cells.
(6)
(c)
Explain prokaryotic DNA replication.
(8)
(Total 20 marks)
62.
If a Sequoia sempervirens tree is 100 m tall and a drawing of it is 100 mm tall, what is the
magnification of the drawing?
A.
×0.001
B.
×0.1
C.
×1.0
D.
×1000
(Total 1 mark)
IB Questionbank Biology
37
63.
Which of the following structures does Escherichia coli have?
I.
70S Ribosomes
II.
Pili
III.
Nucleus
A.
I only
B.
I and II only
C.
II and III only
D.
I, II and III
(Total 1 mark)
64.
What feature do plant cells have but not animal cells?
A.
Plasma membranes
B.
Mitochondria
C.
Cell walls
D.
80S ribosomes
(Total 1 mark)
65.
Cells in the adrenal gland produce the hormone epinephrine and store it in vesicles. To release
epinephrine these vesicles are carried to the plasma membrane and fuse with it. What process is
occurring?
A.
Expulsion
B.
Exchange
C.
Excretion
D.
Exocytosis
(Total 1 mark)
IB Questionbank Biology
38
66.
During reproduction in flowering plants an embryo sac is produced, containing one haploid
nucleus.
This haploid nucleus divides by mitosis three times. What is produced?
A.
One diploid nucleus
B.
Four diploid nuclei
C.
Four haploid nuclei
D.
Eight haploid nuclei
(Total 1 mark)
67.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Draw a labelled diagram to show the fluid mosaic structure of a plasma membrane,
indicating the hydrophilic and hydrophobic regions.
(5)
(b)
Distinguish between active and passive movements of materials across plasma membranes,
using named examples.
(4)
(c)
Explain how the properties of water are significant to living organisms.
(9)
(Total 20 marks)
68.
What does therapeutic cloning involve?
A.
Developing genetically identical cultures of human cells for use in drug testing
B.
Helping infertile couples to conceive by injecting the father’s sperm into the mother’s egg
C.
Producing embryonic stem cells for medical use
D.
Replacing a mutant allele in an embryo to prevent genetic disease
(Total 1 mark)
69.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Draw a labelled diagram to show the ultrastructure of Escherichia coli.
IB Questionbank Biology
39
(5)
(b)
Distinguish between active and passive movements of materials across plasma membranes,
using named examples.
(4)
(c)
Explain how chemiosmosis assists in ATP production during oxidative phosphorylation.
(9)
(Total 20 marks)
70.
What is the correct order of increasing size for the following biological structures?
I.
The width of a virus
II.
The width of a bacterium
III.
The thickness of a cell surface membrane
IV.
The diameter of a eukaryotic cell
A.
I  III  II  IV
B.
I  III  IV  II
C.
III  I  II  IV
D.
III  II  I  IV
(Total 1 mark)
IB Questionbank Biology
40
71.
Which of the following structures are present in both plant and animal cells?
I.
Cell wall
II.
Chloroplast
III.
Mitochondrion
A.
I only
B.
I and II only
C.
I and III only
D.
III only
(Total 1 mark)
72.
In viewing an electron micrograph of a cell, ribosomes, pili and a single circular chromosome are
observed. What other structure is likely to be present?
A.
The rough endoplasmic reticulum (rER)
B.
Mitochondria
C.
A nuclear membrane
D.
A plasmid
(Total 1 mark)
73.
The DNA of a particular cell is damaged, so that the cell continues to divide uncontrollably. What
is the possible result?
A.
Coronary heart disease
B.
AIDS
C.
Tumour formation
D.
Down syndrome
(Total 1 mark)
IB Questionbank Biology
41
74.
What is produced as a result of mitosis?
A.
Two cells, each containing half the number of chromosomes of the original cell
B.
Two cells, each containing the same number of chromosomes as the original cell
C.
Four cells, each containing the same number of chromosomes as the original cell
D.
Four cells, each containing half the number of chromosomes of the original cell
(Total 1 mark)
75.
(a)
Define osmosis.
.....................................................................................................................................
.....................................................................................................................................
(1)
(b)
Outline how transport occurs across membranes by facilitated diffusion.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(2)
(c)
Explain how the properties of phospholipids help to maintain the structure of cell
membranes.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(3)
(Total 6 marks)
IB Questionbank Biology
42
76.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Draw and label a diagram of the ultrastructure of a liver cell.
(4)
(b)
Explain how mitosis produces two genetically identical nuclei.
(8)
(c)
Outline one therapeutic use of stem cells.
(6)
(Total 20 marks)
77.
Which of the following is a feature of exocytosis but not endocytosis?
A.
Shape changes of a membrane
B.
Vesicle formation
C.
Use of ATP
D.
Secretion
(Total 1 mark)
78.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
Draw a labelled diagram showing the structure of a plasma membrane.
(4)
(b)
Outline the role of chlorophyll and the effects of temperature, light intensity and carbon
dioxide concentration on the rate of photosynthesis.
(6)
(c)
Explain the production of energy during aerobic respiration from pyruvate that has been
produced by glycolysis.
(8)
(Total 20 marks)
IB Questionbank Biology
43