Question 1

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

Accepted Answer

Catabolism breaks down complex molecules to release energy, which is then used by anabolism to synthesize complex molecules from simpler ones.

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

During glycolysis, what is the net gain of ATP and NADH molecules per molecule of glucose?

Accepted Answer

$$2$$ ATP and $$2$$ NADH$

Question 4

Which of the following best describes oxidative phosphorylation?

Accepted Answer

ATP synthesis using energy from a proton gradient established by the electron transport chain

Question 5

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

Accepted Answer

O$$_2$$

Question 6

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and preventing substrate binding

Question 7

Which of the following is a correct description of the role of electron carriers in metabolism?

Accepted Answer

They transfer electrons between molecules during redox reactions.

Question 8

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

Accepted Answer

$$2$$ molecules of $$FADH_2$

Question 9

Which process allows cells to regenerate NAD$$^+$$ under anaerobic conditions?

Accepted Answer

Fermentation

Question 10

Which of the following statements about enzymes is FALSE?

Accepted Answer

Enzymes are consumed during the reactions they catalyze.

Question 11

Which of the following is a key difference between substrate-level phosphorylation and photophosphorylation?

Accepted Answer

Photophosphorylation uses light energy to generate ATP, while substrate-level phosphorylation transfers a phosphate group directly from a substrate to ADP.

Question 12

Which of the following is an example of an amphibolic pathway?

Accepted Answer

Krebs cycle

Question 13

A cell is exposed to a noncompetitive inhibitor. What is the most likely effect on enzyme activity?

Accepted Answer

The inhibitor binds to an allosteric site, changing the enzyme's shape and reducing activity.

Question 14

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 15

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis → Synthesis of acetyl-CoA → Krebs cycle → Electron transport chain

Question 16

Which of the following is a function of the Calvin-Benson cycle in photosynthesis?

Accepted Answer

Fixation of carbon dioxide into organic molecules

Question 17

Which of the following statements about the electron transport chain (ETC) is TRUE?

Accepted Answer

The ETC uses energy from electrons to pump protons across a membrane, creating a proton gradient.

Question 18

Which of the following is a product of fermentation in yeast cells?

Accepted Answer

Ethanol

Question 19

Which of the following best describes the role of NAD$$^+ in $$cellular metabolism?

Accepted Answer

It serves as an electron carrier, accepting electrons during redox reactions.

Question 20

A mutation causes a cell to lack the enzyme isomerase. Which metabolic process would be most directly affected?

Accepted Answer

The cell would be unable to convert one isomer of a molecule to another, affecting pathways like glycolysis.

Microbial Metabolism: Chemical Reactions and Pathways

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