Lecture Exam #1
Bi 10, September 27, 2013
Agenda
• Administrative Stuff
• Rules + Format
• Multiple Choice Section
• One-Word Answer Section
• Free Response Section
• Wrap-up
Rules and Format
• Closed book, no collaboration
• No talking or phone use –
talking/phone use/cheating is
grounds for a zero grade
• Raise a hand and ask if you need
clarification
• Answers will be on index cards. At the
end of the test, put your cards in your
envelope, seal it, and write your name
on it.
Card Format
• Write your name on your first index
card and number it from 1 to 20. You
will be putting letters next to each
number.
• Example: 1. A
2. B and C 3. C
etc.
Question 1
Which of the following is/are shared
by all living organisms? Choose
all that apply.
A) Mitochondria
B) Cell walls
C) The electron transport chain
D) Cell membranes
E) DNA
Question 2
During glycolysis, which of the following
does not occur?
A) A six-carbon sugar is broken
into two three-carbon pieces.
B) ATP is converted into ADP.
C) Oxygen and hydrogen are
converted into water.
D) ADP is converted into ATP.
E) NAD+ is converted into
NADH.
Question 3
Which of the following is NOT a step of
the scientific method? (Choose one:)
A) Observation
B) Question
C) Hypothesis
D) Deduction
E) Experiment
Question 4
How many valence electrons does oxygen have?
A) 1
B) 2
C) 3
D) 4
E) 5
F) 6
G) 7
H) 8
Question 5
Most of the dry mass of this cactus plant
comes from… (choose only one)
A) Energy from the sun
B) Gas from the air
C) Minerals from the soil
D) Organic nutrients
from the soil
Question 6
Artificial respiration can be used to help a
patient’s cells get more oxygen. Would this
cure victims of cyanide poisoning? Why or
why not?
A) Yes, because extra oxygen
would let their cells perform
aerobic respiration normally.
B) Yes, because cyanide
paralyzes the diaphragm.
C) No, because cyanide prevents the electron
transport chain from giving electrons to oxygen.
D) No, because cyanide only blocks glycolysis, which
doesn’t need oxygen to harvest energy.
Question 7
Cells in mushrooms are often
dikaryotic. Based on the parts that
make up this vocab word, a
dikaryotic cell must have…
A) No nucleus
B) One nucleus
C) No mitochondria
D) Two mitochondria
E) Two nuclei
Question 8
Which of the following elements are
found in DNA? Choose ALL THAT
APPLY.
A) Oxygen
B) Sulfur
C) Carbon
D) Phosphorus
E) Calcium
F) Hydrogen
Question 9
Which of the following is NOT a
function of proteins?
A) To lower activation energy in
chemical reactions
B) To provide structural support
C) To drive muscle contraction
D) To code for RNA in the nucleus
E) To store amino acids for future use
Question 10
An alpha helix of protein is shown at right.
Which of the following statements is
false? (Choose only one.)
A) This helix is an example of tertiary
protein structure.
B) This kind of helix is found in the
proteins that make up hair.
C) Covalent peptide bonds hold
together the monomers of the helix.
D) Hydrogen bonds give this helix its
shape.
Question 11
Which of the following statements about the
ovarian cycle is false? Choose one:
A) Birth control pills can stop menstruation by
preventing a drop in progesterone.
B) Estrogen and progesterone, hormones that
control the ovarian cycles, are lipid steroid
hormones.
C) Pre-menopausal women usually release one egg
each month if not on birth control.
D) The breakdown of the lining of the uterus is
triggered by an increase in estrogen.
Question 12
What does this diagram show? (Choose one)
A) An enzyme can
help make a
chemical reaction
possible.
B) Energy can be
destroyed by
enzymes.
C) Lipids convert
reactants into
products.
D) Carbohydrates are low in energy.
Question 13
Cellulases are enzymes found in wooddigesting organisms. Based on what you
know, which of the following statements
about cellulases is false? (Choose only one:)
A) Cellulases lower the activation energy needed to
break down cellulose.
B) The products of digestion using cellulases are
sugars.
C) Cellulases are responsible for the dehydration of
cellulose.
D) Cellulases help hydrolysis of a polymer occur.
Question 14
One row of the following table contains a
mistake. Which row is it – A, B, C, or D?
Example of
monomer
Row Type of molecule
A
B
Example of
polymer
Carbohydrate
Glucose
Starch
Protein
Enzyme
Polypeptide
Not a
monomer or
polymer
Not a
monomer or
polymer
C
Lipid
D
Nucleic Acid
Nucleotide
DNA
Question 15
Consider this diagram of the phospholipid bilayer. Are
the regions labeled X and Y hydrophilic or hydrophobic?
A) X is hydrophilic;
Y is hydrophobic.
X B) X and Y are both
hydrophilic.
Y C) X is hydrophobic;
Y is hydrophilic.
X D) X and Y are both
hydrophobic.
Question 16
The pesticide called “1080” (shown below) stops the
citric acid cycle. Which of the following might
plausibly happen to cells poisoned with 1080?
(Choose one.)
A) They produce more ATP,
more NADH, and more CO2.
B) They produce less ATP, less
NADH, and less CO2.
C) They produce less ATP, more
NADH, and less CO2.
D) They produce less ATP, less
NADH, and more CO2.
Question 17
Which of the following is statements about
eukaryotic cells is true? Choose only one.
A) All eukaryotic cells have chloroplasts to
perform photosynthesis.
B) A eukaryotic cell is like a simple “bag” of
fluid, with no other membranes inside of it.
C) Organizing the functions of a cell into
organelles makes chemical reactions more
efficient.
D) Eukaryotic cells do not have a nucleus.
E) Bacteria are eukaryotic cells.
Question 18
Which of the statements below correctly describe this
diagram from your text? Choose all that apply.
A) Sodium is
being oxidized.
B) Sodium is
being reduced.
C) Chlorine is
being oxidized.
D) Chlorine is
being reduced.
Question 19
Which of the following is true of fast twitch muscle
fibers? (Choose only one.)
A) They are mostly used in extended
endurance sports, such as long-distance
running or swimming.
B) They contain more blood vessels than
slow twitch muscle.
C) They need more oxygen than slow twitch
muscle.
D) They perform lactic acid fermentation.
E) They perform alcohol (ethanol)
fermentation.
Question 20
Which of the following statements about energy and/or
entropy is false?
A) Entropy always increases over time; energy is
converted from more useful forms to less useful
(organized) forms.
B) Energy can be created by eating food.
C) Burning a gram of sugar releases more chemical
energy than burning a gram of TNT.
D) Chemical energy can be considered a form of
potential energy.
E) Kinetic energy is the energy of motion.
Answer in one word.
Question 21
Where in our cells does the
electron transport chain
occur?
Answer in one or two words.
Question 22
Is lactose a carbohydrate, lipid,
nucleic acid, or protein?
Choose one.
Answer in one word.
Question 23
What do you call a substance
that prevents a solution’s pH
from rising or falling easily?
Answer in one word.
Question 24
Name an example of a
eukaryotic organism.
Answer in one or two words.
Question 25
Are triglycerides a kind of
protein, lipid, carbohydrate, or
nucleic acid? Choose one.
Answer in one word.
Question 26
Are triglycerides a kind of
protein, lipid, carbohydrate, or
nucleic acid? Choose one.
Answer in one word.
Question 27
What ion does pH measure the
concentration of?
Free Response 1
Name five different
structures found in
eukaryotic cells and tell me
their functions. Be specific!
Free Response 2
Draw an
electron
shell
diagram
for
Chlorine
(Cl).
Free Response 3
Draw a clearly labeled diagram illustrating
the electron transport chain. Be sure to show
all of the following:
• Transfer of electrons, including
• Where the electrons come from
• Where the electrons end up
• The movement of H+
• Where ATP is made
• Any relevant membranes