Question 1

Which of the following statements best describes fermentation?

Accepted Answer

Fermentation uses an organic molecule synthesized by the cell as the final electron acceptor and does not require oxygen.

Question 2

During lactic acid fermentation, what is the fate of pyruvic acid?

Accepted Answer

It is reduced to lactic acid by NADH, regenerating NAD$$^+.$$

Question 3

Which of the following is a key difference between aerobic respiration and fermentation?

Accepted Answer

Aerobic respiration produces significantly more ATP per glucose molecule than fermentation.

Question 4

What is the net ATP yield per glucose molecule during fermentation?

Accepted Answer

$$2$$

Question 5

Which of the following organisms is most likely to perform homolactic fermentation?

Accepted Answer

Streptococcus

Question 6

In alcohol fermentation, what is the sequence of events after glycolysis?

Accepted Answer

Pyruvic acid is converted to acetaldehyde and CO$$_2$$, then acetaldehyde is reduced to ethanol.

Question 7

Why does fermentation produce less ATP than aerobic respiration?

Accepted Answer

Fermentation only partially oxidizes glucose, and does not use the electron transport chain or Krebs cycle.

Question 8

Which of the following best explains why NAD$$^+$$ regeneration is essential during fermentation?

Accepted Answer

NAD$$^+ is $$needed for glycolysis to continue, allowing ATP production.

Question 9

Which of the following is NOT a product of alcohol fermentation?

Accepted Answer

Lactic acid

Question 10

A patient’s muscle cells are deprived of oxygen during intense exercise. Which metabolic pathway will their cells primarily use to generate ATP?

Accepted Answer

Lactic acid fermentation

Question 11

Which of the following best describes the role of the final electron acceptor in fermentation?

Accepted Answer

It is an organic molecule synthesized by the cell, such as pyruvate or its derivative.

Question 12

Which process is common to both fermentation and aerobic respiration?

Accepted Answer

Glycolysis

Question 13

Which of the following is a distinguishing feature of heterolactic fermentation?

Accepted Answer

It produces lactic acid and other compounds.

Question 14

Which of the following best explains why the Krebs cycle does not function during fermentation?

Accepted Answer

NAD$$^+$$ and FAD are not regenerated in the absence of a final electron acceptor.

Question 15

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

Accepted Answer

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

Question 16

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

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

Question 17

Which of the following is true regarding the ATP yield from fermentation compared to aerobic respiration?

Accepted Answer

Fermentation yields less ATP per glucose molecule than aerobic respiration.

Question 18

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

Accepted Answer

Production of bread and alcoholic beverages by yeast.

Fermentation and Its Role in Microbial Metabolism

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