Q: Which of the following equations correctly represents the hydrolysis of ATP to release energy?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy}$$

Question 1

Which of the following best describes the difference between catabolic and anabolic reactions in microbial metabolism?

Accepted Answer

Catabolic reactions break down large molecules into smaller ones, releasing energy; anabolic reactions build large molecules from smaller ones, requiring energy input.

Question 2

A scientist observes that a bacterial culture continues to produce ATP even after oxygen is depleted, but the ATP yield per glucose is much lower than before. Which metabolic process is most likely occurring?

Accepted Answer

Fermentation

Question 3

Which of the following equations correctly represents the hydrolysis of ATP to release energy?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 4

Which statement best explains why enzymes are considered biological catalysts?

Accepted Answer

They lower the activation energy of reactions without being permanently changed.

Question 5

A competitive inhibitor affects an enzyme-catalyzed reaction by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 6

During aerobic respiration in prokaryotes, what is the maximum theoretical yield of ATP per molecule of glucose?

Accepted Answer

$$38$$

Question 7

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

Accepted Answer

It accepts electrons during catabolic reactions and is reduced to NADH.

Question 8

Which process is responsible for converting fatty acids into acetyl CoA for entry into the Krebs cycle?

Accepted Answer

Beta oxidation

Question 9

A bacterium is growing in an environment lacking oxygen but still uses an electron transport chain with nitrate as the final electron acceptor. This process is best described as:

Accepted Answer

Anaerobic respiration

Question 10

Which of the following is a shared pathway between both cellular respiration and fermentation?

Accepted Answer

Glycolysis

Question 11

Why must NAD+ be regenerated during fermentation?

Accepted Answer

To enable glycolysis to continue by accepting electrons.

Question 12

Which of the following best describes the function of chlorophyll in photosynthesis?

Accepted Answer

It absorbs light energy and energizes electrons.

Question 13

A microbe is exposed to a noncompetitive inhibitor. Which of the following best describes the effect on the enzyme?

Accepted Answer

The inhibitor binds elsewhere, changing the enzyme's shape and reducing activity.

Question 14

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

Accepted Answer

Glycolysis $$\rightarrow$$ Transition reaction $$\rightarrow$$ Krebs cycle $$\rightarrow$$ Electron transport chain

Question 15

Which of the following nutrients can be directly converted into intermediates that enter glycolysis?

Accepted Answer

Glycerol

Question 16

A patient with a genetic defect cannot deaminate amino acids. Which metabolic pathway would be most directly affected?

Accepted Answer

Entry of amino acids into glycolysis or the Krebs cycle

Question 17

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It involves direct transfer of a phosphate group to ADP by an enzyme.

Question 18

Which of the following best explains why fatty acids yield more ATP than glucose when fully oxidized?

Accepted Answer

Fatty acids contain more high-energy electrons per molecule.

Question 19

Which of the following is a correct description of feedback inhibition in metabolic pathways?

Accepted Answer

The final product of a pathway inhibits an early enzyme, preventing overproduction.

Question 20

Which of the following is a correct summary of the products of glycolysis per molecule of glucose?

Accepted Answer

$$2$$ pyruvate, $$2$$ NADH, $$2$$ net ATP

Microbial Metabolism: Study Guide and Review

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