Question 1

Which of the following best describes the main function of the electron transport chain (ETC) in cellular respiration?

Accepted Answer

To pump protons across a membrane, creating a proton motive force for ATP synthesis

Question 2

In the TCA cycle, what is the total yield of NADH, FADH$$_2$$, and GTP (or ATP) per acetyl-CoA molecule oxidized?

Accepted Answer

$$3$$ NADH, $$1$$ FADH$$_2$$, $$1$$ GTP

Question 3

Which of the following statements about ATP synthase is CORRECT?

Accepted Answer

ATP synthase uses the flow of protons into the mitochondrial matrix to synthesize ATP.

Question 4

Which molecule acts as the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 5

What is the main enzyme responsible for carbon fixation in the Calvin-Benson cycle?

Accepted Answer

RuBisCO

Question 6

Which of the following best describes the flow of electrons in the mitochondrial electron transport chain?

Accepted Answer

From molecules with more negative $$E_0$$'$$ to more positive E_0$'$$

Question 7

Which of the following is NOT a product of the Calvin-Benson cycle?

Accepted Answer

NADPH

Question 8

During fermentation, how is NAD$$^+$$ regenerated?

Accepted Answer

By transferring electrons to an organic molecule

Question 9

Which of the following is a key difference between the mitochondrial and E. coli electron transport chains?

Accepted Answer

E. coli uses a different array of cytochromes.

Question 10

Which of the following best explains why the TCA cycle is considered amphibolic?

Accepted Answer

It functions in both catabolic and anabolic pathways.

Question 11

Which of the following is NOT a phase of the Calvin-Benson cycle?

Accepted Answer

Oxidation

Question 12

What is the net gain of ATP per molecule of glucose metabolized anaerobically via the Embden-Meyerhof pathway in prokaryotes?

Accepted Answer

$$2$$

Question 13

Which of the following statements about chemiosmosis is CORRECT?

Accepted Answer

It uses the energy from a proton gradient to drive ATP synthesis.

Question 14

Which of the following is a correct pairing of a metabolic pathway and its main product?

Accepted Answer

TCA cycle – NADH

Question 15

Which of the following is true regarding the direction of electron flow in the electron transport chain?

Accepted Answer

Electrons flow from more negative to more positive reduction potential ($$E_0$$'$$).

Question 16

Which of the following is NOT a function of the TCA cycle?

Accepted Answer

Direct production of large amounts of ATP

Question 17

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

Direct transfer of a phosphate group to ADP from a phosphorylated intermediate

Question 18

Which of the following is a product of the light reactions of photosynthesis?

Accepted Answer

ATP and NADPH

Question 19

Which of the following is a correct description of the fate of electrons from NADH in the electron transport chain?

Accepted Answer

They pass through a series of carriers, ultimately reducing oxygen to water.

Question 20

Which of the following is a key difference between cyclic and noncyclic photophosphorylation?

Accepted Answer

Noncyclic photophosphorylation produces both ATP and NADPH.

Microbial Metabolism, Catabolism, Anabolism, and Genetic Regulation

Study Guide - Practice Questions