AP Self Quiz Chapter 9: Cellular Respiration

1. The following statements compare combustion with the aerobic respiration of glucose. Which is FALSE?
a. Combustion releases more total caloric energy from glucose than does respiration.
b. Combustion releases energy from glucose at a more rapid rate than does respiration.
c. Combustion releases nearly all energy as heat and light; respiration captures some of the energy in chemical bonds.
d. Combustion uses heat to provide activation energy; respiration uses enzymes to lower activation energy.
e. Combustion involves the direct transfer of hydrogen atoms to oxygen respiration uses an indirect transfer of hydrogens.

2. Which of the following statements about NAD+ is FALSE?
a. NAD+ is reduced to NADH during both glycolysis and the Krebs cycle.
b. NAD+ has more chemical energy than NADH.
c. NAD+ is reduced by the action of dehydrogenases.
d. NAD+ can receive electrons for use in oxidative phosphorylation.
e. In the absence of NAD+, glycolysis cannot function.

3. Pyruvate is the last product of glycolysis. Which statement below is TRUE?
a. There is more energy in 6 molecules of carbon dioxide than in 2 molecules of pyruvate.
b. There is more energy in pyruvate than in lactate.
c. There is less energy in two molecules of pyruvate that in one molecule of glucose.
d. Pyruvate is in a more oxidized state than carbon dioxide.
e. Pyruvate is in a more reduced state than glucose.

4. Assume that a eukaryotic cell has abundant glucose and O2, but needs ATP. The proton gradient in mitochondria of this cell will be generated by _________ and used primarily for _________.
a. the electron transport chain; ATP synthesis
b. the electron transport chain; substrate phosphorylation
c. glycolysis; production of H2O
d. fermentation; NAD reduction
e. diffusion of protons; ATP synthesis

5. The primary function of the mitochondrion is the production of ATP. To carry out this function, the mitochondrion must have all of the following EXCEPT
a. the membrane-bound electron transport chain.
b. proton pumps embedded in the inner membrane.
c. enzymes for glycolysis.
d. enzymes for the Krebs cycle.
e. mitochondrial ATP synthase.

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

Figure 9.1
6. Refer to Figure 9.1. Starting with acetyl CoA, how many ATP molecules are made through substrate-level phosphorylation?
a. 1
b. 2
c. 11
d. 12
e. more than 20
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
7. Which reaction shows a split of one molecule into two smaller molecules?
a. 1
b. 2
c. 3
d. 4
e. 5

8. In which reaction is a net gain of energy finally realized from glycolysis?
a. 1
b. 2
c. 3
d. 4
e. 5

9. Fermentation is not as energy productive as respiration because
a. it does not take place in a specialized membrane-bound organelle.
b. pyruvate is more reduced than CO2; it still contains much of the energy from glucose.
c. It takes place within the mitochondria of cells.
d. it is the pathway common to fermentation and respiration.
e. NAD+ is regenerated by alcohol or lactate production, without the high energy electrons passing through the electron transport chain.

10. 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

11. All of the following substances are produced in a muscle cell under anaerobic conditions EXCEPT
a. ATP.
b. pyruvate.
c. lactate.
d. acetyl CoA.
e. NADH.

Answer the following question(s), based on the stages of glucose oxidation listed below.
  1. stage I: glycolysis
  2. stage II: oxidation of pyruvate to acetyl CoA
  3. stage III: Krebs cycle
  4. stage IV: oxidative phosphorylation (chemiosmosis)
12. Which one of the stages occurs in the cytoplasm of the cell?
a. 1
b. 2
c. 3
d. 4

13. Carbon skeletons to be broken down during cellular respiration can be obtained from
a. polysaccharide.
b. proteins.
c. lipids.
d. both polysaccharide and proteins.
e. polysaccharide, proteins, and lipids.

Refer to Figure 9.3 to answer the following question(s).

Figure 9.3
14. The electron transport chain energy is used to pump H+ ions into which location?
a. 1
b. 2
c. 3
d. 4
e. 5

15. Glycolysis takes place in which location?
a. 1
b. 2
c. 3
d. 4
e. 5