Cracking the AP Biology Exam

4

Cellular Energetics

CHAPTER 4 QUIZ

Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Select the one that is best in each case. Answers can be found on this page.

1. During lactic acid fermentation, which of the following events is least likely to occur?

(A) An oxygen debt builds.

(B) NADH is reduced.

(C) Lactate accumulates in the muscle tissue.

(D) ATP is produced.

(E) NAD+ is recycled and returns to the Krebs cycle.

2. All of the following statements about exergonic reactions are true EXCEPT

(A) The products contain less energy than the reactants.

(B) The energy released can be used to perform work.

(C) They usually occur instantaneously.

(D) They release energy in the form of ATP or heat.

(E) They require energy input before the reaction can proceed.

3. Which of the following statements is true concerning enzymes?

(A) They always require a coenzyme.

(B) They become hydrolyzed during a chemical reaction.

(C) They are consumed in the reaction.

(D) They operate under a narrow pH range.

(E) They are polymers of carbohydrates.

4. The final acceptor of electrons in the electron transport chain is

(A) hydrogen

(B) water

(C) oxygen

(D) NADH

(E) FADH2

5. Enzymes are affected by all of the following EXCEPT

(A) pH

(B) temperature

(C) chemical agents

(D) concentration of substrates

(E) concentration of water

6. The reaction below represents what type of reaction?

C6H12O6 + 6O2 → 6CO2 + 6H2O + energy

(A) Aerobic respiration

(B) Anaerobic respiration

(C) Glycolysis

(D) Fermentation

(E) Photosynthesis

7. All of the following stages are considered aerobic processes EXCEPT

(A) the Krebs cycle

(B) formation of acetyl CoA

(C) glycolysis

(D) electron transport chain

(E) oxidative phosphorylation

8. Glucose is labeled with 14C and followed as it is broken down to produce CO2, H2O, and ATP in a human muscle cell. This label will be detectable in which of the following sites?

(A) In the cytoplasm only

(B) In the mitochondria only

(C) In the cytoplasm and the mitochondria

(D) In the nucleus and the mitochondria

(E) In the nucleus, cytoplasm, and the mitochondria

9. Eukaryotes carry out oxidative phosphorylation in the mitochondrion. The analogous structure used by prokaryotes to carry out oxidative phosphorylation is the

(A) nuclear membrane

(B) cell wall

(C) plasma membrane

(D) ribosome

(E) endoplasmic reticulum

Directions: Each group of questions consists of five lettered headings followed by a list of numbered phrases or sentences. For each numbered phrase or sentence, select the one heading that is most closely related to it and fill in the corresponding oval on the answer sheet. Each heading may be used once, more than once, or not at all in each group.

Questions 10–14

(A) Pyruvic acid

(B) Alcoholic fermentation

(C) FAD+

(D) ATP synthase

(E) Cofactor

10. An oxidized coenzyme

11. A method of anaerobic respiration

12. An end product of glycolysis

13. An enzyme that utilizes the proton-motive force of chemiosmosis

14. A compound that plays a role in the catalytic action of an enzyme