End of the Chapter Quizzes Cellular Respiration

Question 1

1. The immediate energy source that drives ATP synthesis by ATP synthase during oxidative phosphorylation is the
   a. oxidation of glucose and other organic compounds.
   b. flow of electrons down the electron transport chain.
   c. H+ concentration gradient across the membrane holding ATP synthase.
   d. transfer of phosphate to ADP.

Answer 1

H⁺ concentration across the membrane holding ATP synthase.

Question 2

2. Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?
   a. the citric acid cycle
   b. the electron transport chain
   c. glycolysis
   d. reduction of pyruvate to lactate

Answer 2

glycolysis

Question 3

The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is

a. oxygen.
b. water.
c. NAD+.
d. pyruvate.

Answer 3

a. oxygen.

Question 4

4. In mitochondria, exergonic redox reactions
   a. are the source of energy driving prokaryotic ATP synthesis.
   b. provide the energy that establishes the proton gradient.
   c. reduce carbon atoms to carbon dioxide.
   d. are coupled via phosphorylated intermediates to endergonic processes.

Answer 4

b. provide the energy that establishes the proton gradient.

Question 5

What is the oxidizing agent in the following reaction? Pyruvate + NADH + H+ S Lactate + NAD+ a. oxygen b. NADH c. lactate d. pyruvate

Answer 5

pyruvate

Question 6

. When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?

a. The pH of the matrix increases.
b. ATP synthase pumps protons by active transport.
c. The electrons gain free energy.
d. NAD+ is oxidized.

Answer 6

A) The pH of the matrix increases.

Question 7

7. Most CO2 from catabolism is released during
   a. glycolysis.
   b. the citric acid cycle.
   c. lactate fermentation.
   d. electron transport.

Answer 7

B) the citric acid cycle.