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BIO 191 SI Session
Practice Exam II
1. Which of the following can be used to determine the rate of an enzyme-catalyzed reaction?
A. the rate of substrate formed
B. the decreases in temperature in the system
C. the rate of enzyme formed
D. the rate of enzyme used up
E. the rate of substrate used up
2. Plants carry out photosynthesis during the day and respiration only during the night.
A. true
B. false
The graph below demonstrates two chemical reactions. One is catalyzed by an enzyme, one is not.
3. Which letter shows the energy of activation for the enzyme-catalysed reaction?
A. A
B. B
C. C
D. D
E. E
4. Which letter shows the overall energy released in the reaction?
A. A
B. B
C. C
D. D
E. E
5. The First Law of Thermodynamics states that:
A. It is impossible for the energy within a defined area to increase or decrease.
B. The amount of energy in the universe is constantly decreasing.
C. The amount of energy in the universe is constantly increasing.
D. Energy cannot be created or destroyed.
E. You do not talk about thermodynamics.
6. The Second Law of Thermodynamics states that:
A. The total amount of entropy in the universe is constantly increasing.
B. The total amount of entropy in the universe is constantly decreasing.
C. Entropy cannot be created or destroyed.
D. It is impossible for the entropy within a defined area to increase or decrease.
E. You do not talk about thermodynamics.
7. Which of the following is NOT directly associated with photosystem II?
A. P680
B. harvesting light energy by chlorophyll
C. release of oxygen splitting of water
D. production of NADPH
8. The loss of protons and electrons is known as:
A. dehydration
B. hydration
C. reduction
D. oxidation
E. Both B and D are correct
9. The following process is:
A.
B.
C.
D.
E.
Reduction and is energonic
Reduction and is exergonic
oxidation and is endergonic
oxidation and is exergonic
neither oxidation nor reduction but must be endergonic because energy must be added to the reaction
to get it to begin
Indicate which of the following events occurs during
A. Light-dependent reactions
B. Calvin cycle
8. Oxygen is released A
9. Carbon gets reduced B
10. Oxidative photophosphorylation A
11. ATP produced A
12. Electrons flow through an electron transport chain A
13. Oxidation of NADPH B
14. Reduction of NADP+ A
15. Most energy during cell respiration is harvested during
A. the Krebs cycle
B. oxidative phosphorylation
C. glycolysis
D. the anaerobic respiration
E. fermentation
16. All of the following processes produce ATP except:
A. lactic acid formation
B. oxidative phosphorlyation
C. glycolysis
D. Krebs cycle
E. both A and B
17. Which of the following best describes the reaction shown below?
A + B→ AB + Energy
A. hydrolysis
B. an exergonic reaction
C. and endothermic reaction catabolism
D. an endergonic reaction
18. The role of oxygen in aerobic respiration is:
A. to transport CO2
B. most important in the Krebs cycle
C. to transport electrons in glycolysis
D. to provide electrons for the electron transport chain
E. as the final hydrogen acceptor in the electron transport chain
Match each process with its correct location
19. Glycolysis B
A. the cristae membrane
20. Electron Transport Chain A
B. Cytoplasm
21. Krebs cycle C
C. Inner matrix of mitochondria
22. Which is true of aerobic respiration but not true of anaerobic respiration?
A. CO2 is produced
B. ATP is produced
C. Water is produced
D. Alcohol is produced
E. Pyruvate is produced
23. Which of the following is the most important thing that happens during aerobic respiration?
A. electrons moved down the electron transport chain in a series of redox reactions
B. acetyl CoA enters the Krebs cycle
C. NAD carries hydrogen to the electron transport chain
D. ATP is produced
E. CO2 is produced in the Krebs cycle
24. The ATP produced during fermentation is generated by which of the following?
A. the electron transport chain
B. substrate level phophorylation
C. the Krebs cycle
D. chemiosmosis
E. the citric acid cycle
25. In addition to ATP, what is produced during glycolysis?
A. pyruvate and NADH
B. CO2 and H2O
C. CO2 and ethyl alcohol
D. CO2 and NADH
E. H2O and ethyl alcohol
26. During cellular respiration, most ATP is formed as a direct result of the net movement of
A. sodium ions diffusing across a membrane
B. electrons flowing against a gradient
C. electrons flowing through a channel
D. protons flowing through a channel
E. protons flowing against a gradient
27. Consider the combustion of natural gas in a gas stove: CH4 + O2 => CO2 + H2O + heat. Which
component in this reaction is the oxidizing agent?
A. CH4
B. O2
C. CO2
D. H2O
E. Heat
28. In the same reaction as #27, what component is the reducing agent?
A. CH4
B. O2
C. CO2
D. H2O
E. Heat
29. Where would a noncompetitive inhibitor bind on an enzyme?
A. Active site
B. Allosteric Site
C. N-terminus
D. Hydrophobic region
30. How many turns of the Calvin cycle are required to produce one molecule of glucose?
A. 1
B. 2
C. 3
D. 6
E. 12
31. CAM plants keep their stomates closed during the daytime to reduce excess water loss. They can do this
because they
A. can fix CO2 into sugars in the mesophyll cells
B. can use photosystems I and II at night
C. modify rubisco so it does not bind with oxygen
D. can incorporate CO2 into organic acids at night
E. have lenticels instead of stomates
32. After stenuous exercise, a muscle cell would contain decreased amounts of ________ and increased
amounts of _________.
A. glucose; ATP
B. ATP; glucose
C. ATP; lactic acid
D. lactic acid; ATP
E. CO2; pyruvic acid
33. Where in the cell is ATP synthase located?
A. in the plasma membrane
B. in the nuclear membrane
C. in the thylakoid membrand of the chloroplast
D. in the cristae membrane of mitochondria
E. both C and D
34. Which of the following is NOT required for photosynthesis to occur?
A. CO2
B. O2
C. ATP
D. NADP
E. All of the above are required
35. Which of the following is true of an exergonic reaction?
A. Delta G is negative
B. the products have more free energy than reactants
C. the reaction is non-spontaneous
D. formation of polymers is an exergonic reaction
36. According to the second law of thermodynamics, every transfer of energy is accompanied by an
increase in which of the following?
A. free energy
B. entropy
C. temperature
D. order
37. Which of the following does not occur by mitosis?
a. Growth
b. Production of gametes
c. Repair
d. Development in the embryo
e. Cleavage
The following two questions refer to the sketch below of the cell containing chromosomes.
38. How many chromosomes are in this cell?
a. 2
b. 4
c. 8
d. 16
e. 32
39. How many chromatids are in this cell?
a. 2
b. 4
c. 8
d. 16
e. 32
40. In which stage of the life of a cell is the nucleolus always visible?
a. Prophase
b. Anaphase
c. Telophase
d. Cytokinesis
e. Interphase
41. If a cell has 24 chromosomes at the beginning of meiosis, how many chromosomes will it have at the
end of meiosis?
a. 6
b. 12
c. 24
d. 48
e. The number varies with species
42. If a cell has 24 chromosomes, how many will it have at the end of mitosis?
a. 6
b. 12
c. 24
d. 48
e. The number varies with species
43. All of the following are true of meiosis EXCEPT
a. Crossover occurs during prophase I
b. There is no replication of chromosomes between meiosis I and meiosis II
c. In plants, spindle fibers are attached to the centriole
d. Synapsis occurs during prophase I
e. The longest phase is prophase
44. Homologous chromosomes separate during
a. Prophase I
b. Prophase II
c. Anaphase of mitosis
d. Anaphase I
e. Anaphase II