If you were to expose cells that are undergoing aerobic respiration to a radioactive oxygen isotope in the form of O₂, which of the following molecules would you expect to be radiolabeled?
a. Pyruvate
b. Water
c. NADH
d. CO₂

In step 3 of the citric acid cycle, the enzyme isocitrate dehydrogenase is regulated by NADH. Compare and contrast the regulation of this enzyme with the regulation of phosphofructokinase in glycolysis.

The researchers who observed that magnetite was produced by bacterial cultures from the deep subsurface carried out a follow-up experiment. These biologists treated some of the cultures with a drug that poisons the enzymes involved in electron transport chains. In cultures where the drug was present, no more magnetite was produced. Does this result support or undermine their hypothesis that the bacteria in the cultures perform cellular respiration? Explain your reasoning.

After glucose is fully oxidized by glycolysis, pyruvate processing, and the citric acid cycle, where is most of its energy stored?

Compare and contrast substrate-level phosphorylation and oxidative phosphorylation.

Explain the relationship between electron transport and oxidative phosphorylation. How do uncoupling proteins 'uncouple' this relationship in brown adipose tissue?

Which of the following correctly describe the fermentation pathway? Select True or False for each statement.

T/FIt includes a reaction that oxidizes NADH to NAD⁺.

T/FIt synthesizes ATP by substrate-level phosphorylation.

T/FIt includes a reaction that reduces NAD⁺ to NADH.

T/FIt synthesizes electron acceptors, so that cellular respiration can continue.