Bio Chapter 9 practice

D) in both glycolysis and the citric acid cycle

1) In which reactions of cellular respiration and fermentation does substrate-level phosphorylation occur? A) only in glycolysis B) only in the citric acid cycle C) only in the electron transport chain D) in both glycolysis and the citric acid cycle

C) The glucose molecule is oxidized.

5) What happens to a glucose molecule when it loses a hydrogen atom as the result of an oxidation-reduction reaction? A) The glucose molecule is hydrolyzed B) The glucose molecule is an oxidizing agent. C) The glucose molecule is oxidized. D) The glucose molecule is reduced.

A) NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.

7) Which of the following statements about NAD+ is true? A) NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle. B) NAD+ has more chemical energy than NADH. C) NAD+ can donate electrons for use in oxidative phosphorylation. D) In the absence of NAD+, glycolysis can still function.

A) The more electronegative atom is reduced, and energy is released.

What happens when electrons are passed from one atom to a more electronegative atom? A) The more electronegative atom is reduced, and energy is released. B) The more electronegative atom is reduced, and energy is consumed. C) The more electronegative atom is oxidized, and energy is consumed. D) The more electronegative atom is oxidized, and energy is released.

C) reduced

When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a proton), the molecule becomes ________. A) dehydrogenated B) oxidized C) reduced D) redoxed

B) It loses electrons and loses potential energy.

Which of the following statements describes what happens to a molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction? A) It gains electrons and gains potential energy. B) It loses electrons and loses potential energy. C) It gains electrons and loses potential energy. D) It loses electrons and gains potential energy.

A) C6H12O6 is oxidized and O2 is reduced.

Which of the summary statements below describes the results of the following reaction? C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy A) C6H12O6 is oxidized and O2 is reduced. B) O2 is oxidized and H2O is reduced. C) CO2 is reduced and O2 is oxidized. D) O2 is reduced and CO2 is oxidized.