Brooks School



AP Biology Quiz on Chapter 9

1. All of the following statements about glycolysis are true EXCEPT
a. glycolysis has steps involving oxidation-reduction reactions.
b. the enzymes of glycolysis are located in the cytosol of the cell.
c. glycolysis can operate in the complete absence of O2.
d. the end products of glycolysis are CO2 and H20.
e. glycolysis makes ATP exclusively through substrate-level phosphorylations.

2. What does chemiosmosis involve?
a. The diffusion of water down an electrochemical gradient that drives ATP synthesis.
b. A proton gradient that drives the redox reactions of electron transport.
c. A proton-motive force that drives the synthesis of ATP.
d. An ATP synthase that pumps protons across the inner mitochondrial membrane.
e. The uptake of NADH produced in glycolysis into the mitochondrion.

3. Muscle cells in oxygen deprivation convert pyruvate to ________ and in this step gain ________.
a. lactate; ATP
b. alcohol; CO2
c. alcohol; ATP
d. ATP; NAD+
e. lactate; NAD+

4. Phosphofructokinase is an important control enzyme. Which of the following statements concerning this enzyme is FALSE?
a. It is activated by citrate.
b. It is inhibited by ATP.
c. It is activated by ADP.
d. It is a coordinator of the processes of glycolysis and the Krebs cycle.
e. It is an allosteric enzyme.

5. Which type of enzyme in cellular respiration is primarily responsible for removing electrons from organic molecules?
a. decarboxylase
b. ATP synthase
c. deaminase
d. dehydrogenase
e. phosphofructokinase

6. Why is it impossible to quantify the amount of ATP derived from each glucose molecule during cellular respiration?
a. Our techniques are not good enough.
b. The mitochondria are too unstable.
c. The proton gradient is used for many purposes.
d. ATP is used up as soon as it is produced.
e. The ATP remains inside the mitochondria.

7. Which process in eukaryotic cells will normally proceed whether O2 is present or absent?
a. fermentation
b. glycolysis
c. Krebs cycle
d. oxidative phosphorylation
e. electron transport

8. A fatty acid is partially oxidized to form 10 molecules of acetyl CoA. Starting with these 10 molecules, how many molecules of ATP will be made directly by the Krebs cycle only?
a. 10
b. 20
c. 32
d. 320
e. 686

Use Figure 9.1 to answer the following question(s).

Figure 9.1

9. Refer to Figure 9.1. If citric acid has six carbon atoms, how many carbon atoms does succinic acid have?
a. 1
b. 4
c. 5
d. 6
e. 12

Refer to Figure 9.2 to answer the following question(s). In Figure 9.2 there are some reactions of glycolysis in their proper sequence. Each reaction is numbered. Use these letters to answer the questions.

Figure 9.2
10. In which reaction is there a loss of energy?
a. 1
b. 2
c. 3
d. 4
e. 5

11. The ATP made during fermentation is generated by which of the following?
a. substrate-level phosphorylation
b. electron transport
c. photophosphorylation
d. chemiosmosis
e. oxidation of NADH

12. Catabolism of proteins, lipids, and carbohydrates can result in a 2-carbon molecule which enters the Krebs cycle. What is the molecule?
a. glucose
b. acetyl acids
c. fatty acids
d. amino acids
e. pyruvate

13. Suppose a yeast cell uses 10 moles of glucose for energy production. No oxygen is available. What will be the net yield of ATP in moles?
a. 12
b. 15
c. 20
d. 30
e. 36

14. When hydrogen ions are pumped from the mitochondrial matrix, across the inner membrane, and into the intermembrane space, the result is
a. the formation of ATP.
b. the reduction of NAD.
c. the restoration of the Na+-K+ balance across the membrane.
d. the creation of a proton gradient.
e. the lowering of pH in the mitochondrial matrix.

15. Where is ATP synthase located in the mitochondrion?
a. ribosomes
b. cytochrome system
c. outer membrane
d. F1 particle of inner membrane
e. matrix