Q: Which of the following equations correctly represents the net ATP gain from glycolysis per molecule of glucose?

$$2 \text{ ATP in} + 4 \text{ ATP out} = 2 \text{ net ATP}$$

Question 1

Which of the following best describes the difference between catabolism and anabolism in microbial metabolism?

Accepted Answer

Catabolism is the breakdown of larger molecules into smaller products, releasing energy, while anabolism is the synthesis of larger molecules from smaller ones, requiring energy.

Question 2

Which of the following equations correctly represents the net ATP gain from glycolysis per molecule of glucose?

Accepted Answer

$$2 	ext{ ATP in} + 4 	ext{ ATP out} = 2 	ext{ net ATP}$$

Question 3

Which of the following statements about enzymes is CORRECT?

Accepted Answer

Enzymes lower the activation energy required for a reaction, allowing it to proceed more rapidly.

Question 4

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site, preventing substrate binding.

Question 5

Which of the following is the correct sequence of events in aerobic glucose catabolism?

Accepted Answer

Glycolysis → Krebs Cycle → Electron Transport Chain

Question 6

Which of the following is NOT a component of a holoenzyme?

Accepted Answer

Substrate

Question 7

In the electron transport chain, what is the primary role of oxygen in aerobic respiration?

Accepted Answer

To serve as the final electron acceptor, forming water

Question 8

Which of the following best describes feedback inhibition in metabolic pathways?

Accepted Answer

The end-product of a pathway inhibits an enzyme at the start of the pathway.

Question 9

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is generated directly by the transfer of a phosphate group from a phosphorylated intermediate to ADP.

Question 10

Which of the following is a function of NAD+ in cellular respiration?

Accepted Answer

Acts as an electron carrier, accepting electrons during glycolysis and the Krebs cycle

Question 11

Which of the following is TRUE regarding the Calvin-Benson cycle?

Accepted Answer

It fixes carbon dioxide into organic molecules using ATP and NADPH.

Question 12

Which of the following is a distinguishing feature of noncyclic photophosphorylation compared to cyclic photophosphorylation?

Accepted Answer

Noncyclic photophosphorylation produces both ATP and NADPH, while cyclic produces only ATP.

Question 13

Which of the following best explains why fermentation is less efficient than aerobic respiration?

Accepted Answer

Fermentation does not use the Krebs cycle or electron transport chain, resulting in less ATP production.

Question 14

Which of the following is NOT a class of electron carriers in the electron transport chain?

Accepted Answer

Kinases

Question 15

A patient is diagnosed with a genetic disorder that results in nonfunctional coenzymes. Which of the following processes would be most directly affected?

Accepted Answer

The catalytic activity of holoenzymes

Question 16

Which of the following best describes the role of ATP synthase in chemiosmosis?

Accepted Answer

It uses the energy from the proton gradient to phosphorylate ADP to ATP.

Question 17

Which of the following is a correct pairing of enzyme type and function?

Accepted Answer

Oxidoreductase – catalyzes oxidation-reduction reactions

Question 18

Which of the following scenarios best illustrates allosteric inhibition?

Accepted Answer

A molecule binds to a site other than the active site, causing the enzyme’s active site to change shape and lose affinity for the substrate.

Question 19

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

Accepted Answer

Six molecules of NADH

Question 20

Which of the following best describes the induced-fit model of enzyme activity?

Accepted Answer

The enzyme’s active site changes shape to better fit the substrate upon binding.

Microbial Metabolism: Core Concepts and Pathways

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