Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) Some, but not all, protein complex sites associated with the ETC serve as proton pumps.
(2) The rate at which the CAC operates is controlled by the body's need for ATP.
(3) Anabolic reactions usually require energy input in order to proceed.

Question

Quizplus · Accepted Answer

All three statements are true: (1) is true because in the electron transport chain (ETC), some complexes pump protons across the membrane to create a proton gradient, but not all complexes have this function. (2) is true because the citric acid cycle (CAC) is regulated by the energy needs of the cell, with ATP demand influencing its rate. (3) is true because anabolic reactions, which build complex molecules from simpler ones, typically require energy, often in the form of ATP.

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