Name:
Student Number:
All students, from all sections, welcome!
The University Learning Centre and the Peer Mentors Present:
Biol120 Mock Midterm Examination
Wednesday, October 8th, 2014
Time: 5:30-6:20 (50 mins)
Location: HLTH 1150
Important note: This mock midterm was written by your Biology Peer Mentors (not your
professors)! It is designed to help you test yourself on topics and concepts covered in class
and should, by no means, be considered a “preview” of the actual midterm. Be sure to send
a thank-you to your Peer Mentors, if you see them in the hallways!
You have 50 minutes to complete this exam. You are required to remain in your seat for 30
minutes, but are free to leave the room after 30 minutes (6:00). No talking. No use of
electronic devices (ie. cell phones, lap tops, etc.).
This exam consists of 50 questions. Each question is worth 1 starship for a total of 50
starships. Be sure to carefully read the questions and all possible answers. Choose the
most correct answer. Only select one answer per questions.
1. Which is NOT a characteristic of a eukaryote?
a) contains membrane-bound organelles
b) contains a nucleoid region
c) relatively complex
d) divides by mitosis
2. The plasma membrane consists of:
a) a phospholipid bilayer
b) embedded proteins
c) cholesterol
d) all of the above
3. Which of the following best describes Scanning Electron Microscopy?
a) Uses the properties of visible light to create flat images
b) Uses a stream of electrons to create 3D image of the surface of the sample
c) Uses chemically fluorescent dyes to create flat images of high contrast
d) Uses a stream of electrons to create flat images of a thin section of a sample
4. Gametes and sperm are:
a) diploid
b) haploid
c) produced by mitosis
d) only produced in animals
Questions and answers for the mock midterm will be posted on Thursday 9 October at:
http://www.usask.ca/ulc/sss, as well as to your blackboard course. 1
5. Which of these is a transmembrane protein?
a) Carrier proteins
b) Channel proteins
c) Both a) and b)
d) None of the above
6. An animal’s life cycle is:
a) Diploid Dominant
b) Haploid Dominant
c) Alternation of Generations
d) None of the above
7. The earliest direct evidence of life is?
a) Stromatolites
b) Iron Bands
c) Prokaryotic DNA Tracing Techniques
d) Mitochondrial DNA Tracing
8. Why do cells need to divide?
a) Growth
b) Repair
c) Reproduction
d) All of the above
9. Which of the following is NOT a common cellular component of both eukaryotic and
prokaryotic cells?
a) region containing DNA
b) plasma membrane
c) ribosomes
d) mitochondria
10. Which of the following in NOT a tenet of cell theory?
a) All organisms are composed of at least one cell
b) The cell is the basic unit of life
c) Cells arise from preexisting cells
d) All cells store their genetic material in structures called chromosomes
11. In eukaryotes, the nucleus ___________:
a) stores the cell's genetic material in the form of DNA
b) allows for transport of material in and out of its nuclear envelope through many
small pores
c) may contain a structure called a nucleolus
d) all of the above
Questions and answers for the mock midterm will be posted on Thursday 9 October at:
http://www.usask.ca/ulc/sss, as well as to your blackboard course. 2
12. Which is an anabolic pathway?
a) One which consumes energy to break down complex molecules
b) One which builds complex molecules, releasing energy
c) One which breaks down complex molecules, releasing energy
d) One which consumes energy to build complex molecules
13.
What stage of Meiosis is the following image:
(image citation information is on answer page)
a)
b)
c)
d)
Prophase I
Metaphase II
Telophase I
Anaphase II
14. The plasma membrane contains which of the following:
a) Proteins
b) Phospholipids
c) Cholesterols
d) All of the above.
15. How would a cell transport a protein through its membrane?
a) Endocytosis and exocytoisis
b) Facilitated diffusion
c) Active transport
d) It depends on the polarity, charge, and size of the protein
16. Which of these pumps are used to establish a membrane potential?
a) H+ pump
b) Ca+ pump
c) Na+/K+ pump
d) All of the above
17.
In what stage does crossing over occur in meiosis
a) Metaphase II
b) Anaphase I
c) Prophase I
d) Telophase II
Questions and answers for the mock midterm will be posted on Thursday 9 October at:
http://www.usask.ca/ulc/sss, as well as to your blackboard course. 3
18. What determines the rate of diffusion across a membrane?
a) Solute concentration
b) Change in entropy
c) Protein channel content of a membrane
d) Both a) & b)
19. Identify the exergonic reaction.
a) A + B à C
ΔG= -7.2 kcal/mol
b) Q + S à R
T= 35°C
c) A + B à C + D ΔG= +11.4 kcal/mol
d) D + F à G + I T= 337 K
20. How do cells regenerate ATP?
a) By combining ADP and Pi in an endergonic reaction
b) By combining ADP and Pi in an exergonic reaction
c) Using ATP hydrolysis in an endergonic reaction
d) Using ATP hydrolysis in an exergonic reaction
21. Which molecule would pass through the membrane most slowly?
a) Glycerol
b) Indole
c) CO2
d) Glucose
22. What are the first and second laws of thermodynamics?
a) The total amount of energy in a system is constant, but the energy in the
surroundings may change. The total entropy in a system and its surroundings
always decreases.
b) The total amount of energy in a system and its surroundings is constant. The total
entropy of a system and its surroundings always increases.
c) The total amount of energy in a system is constant, but the energy in the
surroundings may change. The total entropy of a system and its surroundings
always increases.
d) The total amount of energy in a system and its surroundings is constant. The total
entropy in a system and its surroundings always decreases.
23. A major effect of the rise in cyanobacteria 2.5 billion years ago was…
a) The accumulation of O2 in the atmosphere
b) The widespread use of H2O as an electron donor for photosynthesis
c) Formation of banded iron deposits
d) All of the above
24. What directly provides the energy for secondary active transport?
a) Primary active transport
b) ATP
c) Concentration gradient of another molecule
d) None of the above
Questions and answers for the mock midterm will be posted on Thursday 9 October at:
http://www.usask.ca/ulc/sss, as well as to your blackboard course. 4
25. What characteristic of the eukaryotic cell makes cells division different from that which
occurs in prokaryotic cells?
a) More complex cell
b) Multiple chromosomes
c) Both a) & b)
d) None of these are correct
26. What are the limitations of cell division?
a) The cell needs to be at the correct stage of the cell cycle
b) Time of the day
c) Location in the multi-cellular organism
d) The amount of mitotic spindles in the cell
27. After equilibrium is reached in the concentration of solutes inside and outside a cell,
what will be the net movement of molecules?
a) Into the cell
b) Out of the cell
c) In and out of the cell at equal rates
d) The membrane doesn’t allow any molecular movement after equilibrium
28. In phospholipids, the phosphate head is ____________, and the lipid tails are
_____________.
a) Hydrophobic, Hydrophobic
b) Hydrophobic, Hydrophilic
c) Hydrophilic, Hydrophobic
d) Hydrophilic, Hydrophilic
29. Movement is considered one of the seven characteristics of life.
a) True
b) False
c) It depends on the Kingdom of the organism
d) It depends on the Domain of the organism
30. The hydrolysis of ATP involves
a) Adding water to ATP to release free energy
b) Removing adenine from ATP to release free energy
c) Removing water from ATP to release free energy
d) Adding adenine to ATP to release free energy
31. How do enzymes catalyze reactions?
a) By lowering the activation energy
b) By increasing substrate concentration
c) By lowering substrate concentration
d) By being used up in the reaction
Questions and answers for the mock midterm will be posted on Thursday 9 October at:
http://www.usask.ca/ulc/sss, as well as to your blackboard course. 5
32. What phase makes up 90% of the cell cycle?
a) G1
b) S
c) G2
d) Interphase
33. The Smooth Endoplasmic Reticulum ____________:
a) is where the cell synthesizes proteins.
b) stores genetic material in the form of RNA.
c) is the site of lipid synthesis in the cell.
d) contains hydrolytic enzymes which digests old cellular parts.
34. Vesicles from Golgi body can send molecules outside of the cell in a process known as:
a) Endocytosis
b) Exocytosis
c) Pinocytosis
d) Phagocytosis
35. What is a closed system?
a) One that does not exchange matter or energy with its surroundings
b) One that exchanges matted with its surroundings
c) One that exchanges energy with its surroundings
d) One that exchanges energy and matter with its surroundings
36. The cell wall is made of:
a) Chitin
b) Cellulose
c) Phospholipids
d) Proteins
37. The substance that an enzyme binds to is called its...
a) Ligand
b) Substrate
c) Soul Mate
d) Allosteric Activator
38. An amoeba traps its prey in a vesicle before digesting it. This process is known as:
a) Exocytosis
b) Pinocytosis
c) Phagocytosis
d) None of the Above
39. Which of the following does NOT correctly describe microtubules?
a) made of actin dimers
b) associates with the motor proteins Dynein and Kinesin
c) form the centrioles in animal cells
d) is the largest in size of the eukaryotic cytoskeletal components
Questions and answers for the mock midterm will be posted on Thursday 9 October at:
http://www.usask.ca/ulc/sss, as well as to your blackboard course. 6
40. What happens in Telophase?
a) Chromosomes de-condense and spindle disassemble
b) A checkpoint to see if all chromosomes are in the right orientation
c) Furrowing
d) Chromosomes condense
41. What are the 2 mechanisms that mitotic spindles use to move chromosomes?
a) Spindle mid-point and kinetochore microtubules
b) Non-kinetochore microtubules and kinetochore microtubules
c) Hormones and centromere
d) None of the above
42. What is the role of kinetochore?
a) The main microtubule organizing center
b) Attached to the chromosome and walks along microtubules
c) Condenses chromosomes
d) Regulates cell division
43. The characteristics of life are said to be emergent because…
a) According to the Theory of Evolution all life comes from one common ancestor
(LUCA)
b) They emerge from simple molecules and interactions which are lacking the
ability to perform the complex functions
c) They emerge/appear in every known order of life
d) They do not emerge in virus
44. Which of the following common attributes of life support the Theory of LUCA?
a) A system of protein assembly from amino acids using mRNA and tRNA
b) The breakdown of glucose by a pathway to create ATP
c) Reliance on proteins as the major structural and catalytic molecule
d) All of the above
45. Why are enzymes needed in biological systems?
a) They are food for the cell
b) They slow down reactions that occur to quickly
c) They speed up reactions that occur to slowly
d) They make the cell look cool when it’s with its other cell buddies
46. Pure water is contained in a balloon that is a semipermeable membrane. When
submerged in a sugar solution, the balloon expands. The water in the balloon is
___________ to the sugar solution of the container.
a) Hypertonic
b) Hypotonic
c) Isotonic
d) None of the above
Questions and answers for the mock midterm will be posted on Thursday 9 October at:
http://www.usask.ca/ulc/sss, as well as to your blackboard course. 7
47. The area on an enzyme where the reactant molecule attaches is called the:
a) Active Site
b) Allosteric Site
c) Open Site
d) Reaction Site
48. A nerve cell is trying to move sodium ions (Na+) into its cytoplasm, against the
concentration gradient. The best process to achieve this would be:
a) Simple Diffusion
b) Osmosis
c) Passive Transport
d) Active Transport
49. Plant cells have:
a) A Cell Wall
b) Plasma Membrane
c) Centrioles
d) Both A and B
50. In a solution where enzyme concentration is kept constant but substrate concentration
is variable, what is the limiting factor in the rate of catalysis?
a) The substrate concentration
b) The product concentration
c) The enzyme concentration
d) The concentration of yeast
Bonus Questions!
51. What is the ATP cycle?
a) Using ATP to power cell division in the cell cycle
b) The use of ATP to power the Calvin cycle
c) Breaking down ATP to power muscle contractions
d) Building ATP from ADP + Pi, followed by the breakdown of ATP
52. What is seen as the fundamental prerequisite for development of life on a planet?
a) The planet has a reducing atmosphere which promotes the spontaneous
development of macromolecules
b) The planet has a oxidizing atmosphere which promotes the spontaneous
development of macromolecules
c) The planet lies in the habitable zone which is a distance from the sun where water
can exist as a liquid
d) The planet has suitable free energy for life to both form and be sustainable
53. Which of the following is NOT a fundamental mechanism of enzyme action?
a) Bringing the reactant molecules together
b) Etherification of the ligand
c) Exposing the reactant molecule to altered charge environments
d) Changing the shape of the substrate molecule
Questions and answers for the mock midterm will be posted on Thursday 9 October at:
http://www.usask.ca/ulc/sss, as well as to your blackboard course. 8