Chapter 9 - Book and Quiz Questions

The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is: A. oxygen B. water C. NAD+ D. pyruvate E. ADP

A. oxygen

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. the cytochromes phosphorylate ADP to form ATP E. NAD+ is oxidized

A. the pH of the matrix increases

What is the reducing agent in the following reaction? Pyruvate + NADH + H+ --> Lactate + NAD+ A. oxygen B. NADH C. NAD+ D. lactate E. pyruvate

B. NADH

Which of the following is a true distinction between fermentation and cellular respiration? A. only respiration oxidizes glucose B. NADH is oxidized by the electron transport chain in respiration only C. fermentation, but not respiration, is an example of a catabolic pathway D. substrate-level phosphorylation is unique to fermentation E. NAD+ functions as an oxidizing agent only in respiration

B. NADH is oxidized by the electron transport chain in respiration only

Most CO2 from catabolism is released during: A. glycolysis B. the citric acid cycle C. lactate fermentation D. electron transport E. oxidative phosphorylation

B. the citric acid cycle

Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecules? A. the citric acid cycle B. the electron transport chain C. glycolysis D. synthesis of acetyl CoA from pyruvate E. reduction of pyruvate to lactate

C. glycolysis

In mitochondria, exergonic redox reactions: A. are the source of energy driving prokaryotic ATP synthesis B. are directly coupled to substrate-level phosphorylation C. provide the energy that establishes the proton gradient D. reduce carbon atoms to carbon dioxide E. are coupled via phosphoryl;ated intermediates to endergonic processes

C. provide the energy that establishes the proton gradient

Cells do not catabolize carbon dioxide because: A. its double bonds are too stable to be broken B. CO2 has fewer bonding electrons than other organic compounds C. CO2 is already completely reduced D. CO2 is already completely oxidized E. the molecule has too few atoms

D. CO2 is already completely oxidized

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. affinity of oxygen for electrons D. H+ concentration across the membrane holding ATP synthase E. transfer of phosphate to ADP

D. H+ concentration across the membrane holding ATP synthase