Question 1

Which of the following statements best describes the relationship between catabolism and anabolism in cellular metabolism?

Accepted Answer

Catabolism breaks down large molecules to release energy, which is then used by anabolism to synthesize macromolecules.

Question 2

Which of the following is NOT a function of ATP in cellular metabolism?

Accepted Answer

Serving as a precursor metabolite for macromolecule synthesis.

Question 3

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is generated by the direct transfer of a phosphate group to ADP from an intermediate substrate in catabolism.

Question 4

Which of the following is a correct pairing of electron carrier and its reduced form?

Accepted Answer

NAD+ and NADH

Question 5

A competitive inhibitor of an enzyme acts by:

Accepted Answer

Binding to the active site, preventing substrate binding.

Question 6

Which of the following is a product of the Krebs cycle for each molecule of glucose?

Accepted Answer

Six molecules of NADH

Question 7

During aerobic respiration, the final electron acceptor in the electron transport chain is:

Accepted Answer

Oxygen (O2)

Question 8

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation regenerates NAD+ for glycolysis by transferring electrons to an organic molecule.

Question 9

Which of the following is a key difference between the pentose phosphate pathway and glycolysis?

Accepted Answer

The pentose phosphate pathway generates precursor metabolites for nucleotide synthesis.

Question 10

Which of the following best explains why cells regulate metabolic pathways through feedback inhibition?

Accepted Answer

To prevent the overproduction of end products and conserve resources.

Question 11

Which of the following is NOT a factor that affects enzyme activity?

Accepted Answer

Oxygen concentration

Question 12

Which of the following statements about amphibolic pathways is correct?

Accepted Answer

They are metabolic pathways that can function in both anabolism and catabolism.

Question 13

In the process of photosynthesis, the light-dependent reactions:

Accepted Answer

Generate ATP and NADPH using light energy.

Question 14

Which of the following is a correct description of the role of chlorophyll in photosynthesis?

Accepted Answer

Chlorophyll absorbs light energy and transfers it to reaction centers in photosystems.

Question 15

Which of the following is a direct result of the flow of protons through ATP synthase during chemiosmosis?

Accepted Answer

Phosphorylation of ADP to ATP

Question 16

Apoenzymes are inactive because they:

Accepted Answer

Lack their necessary cofactors or coenzymes.

Question 17

Which of the following is a product of lipid catabolism that enters the Krebs cycle?

Accepted Answer

Acetyl-CoA

Question 18

Which of the following best describes the process of oxidative phosphorylation?

Accepted Answer

ATP is produced using energy from a proton gradient established by the electron transport chain.

Question 19

Which of the following is a real-world example of fermentation?

Accepted Answer

Production of Swiss cheese by Propionibacterium.

Question 20

Which of the following regulatory mechanisms allows a cell to quickly adjust enzyme activity in response to changing conditions?

Accepted Answer

Allosteric regulation

Microbial Metabolism: Key Concepts and Pathways

Study Guide - Practice Questions