Question 1

Which of the following best describes the primary goal of fermentation in cells?

Accepted Answer

To convert NADH to NAD$$^+ so $$glycolysis can continue

Question 2

During strenuous exercise, muscle cells switch to lactic acid fermentation. What is the immediate benefit of this switch?

Accepted Answer

It enables the regeneration of NAD$$^+$$, allowing glycolysis to continue

Question 3

Which of the following equations correctly represents the net reaction for lactic acid fermentation?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 2\ \mathrm{ADP} + 2\ \mathrm{P_i} \rightarrow 2\ \mathrm{C_3H_6O_3} + 2\ \mathrm{ATP}$$

Question 4

Why is the evolution of an oxygen-rich atmosphere considered crucial for the diversification of life on Earth?

Accepted Answer

It enabled the evolution of aerobic respiration, which produces much more ATP than anaerobic processes

Question 5

Which of the following is a key difference between alcohol fermentation and lactic acid fermentation?

Accepted Answer

Alcohol fermentation releases CO$$_2$$, while lactic acid fermentation does not

Question 6

A baker uses yeast to make bread rise. Which product of yeast fermentation is directly responsible for the bread rising?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 7

In the absence of oxygen, how many net ATP molecules are produced per glucose molecule during glycolysis followed by fermentation?

Accepted Answer

2

Question 8

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation occurs in the cytoplasm and does not require oxygen

Question 9

A patient with a genetic defect that prevents the regeneration of NAD$$^+$$ during fermentation would most likely experience which of the following symptoms during intense exercise?

Accepted Answer

Rapid fatigue due to inability to continue glycolysis

Question 10

Which of the following best explains why alcohol is toxic to yeast during fermentation?

Accepted Answer

Alcohol disrupts cellular membranes and enzyme function at high concentrations

Question 11

Which of the following is a real-world application of lactic acid fermentation by bacteria?

Accepted Answer

Production of yogurt and pickles

Question 12

If a yeast cell is placed in an anaerobic environment with abundant glucose, which of the following will occur?

Accepted Answer

The yeast will perform alcohol fermentation, producing ethanol and CO$$_2$$

Question 13

Which of the following best describes the fate of pyruvate in human muscle cells under anaerobic conditions?

Accepted Answer

It is converted to lactic acid to regenerate NAD$$^+$$

Question 14

Which of the following is NOT a product of glycolysis followed by lactic acid fermentation?

Accepted Answer

CO$$_2$$

Question 15

A scientist is studying a strain of bacteria that can survive in the absence of oxygen by using fermentation. Which of the following must be true about this bacterium?

Accepted Answer

It can regenerate NAD$$^+$$ without oxygen

Question 16

Which of the following best explains why only 2 ATP are produced per glucose during fermentation, compared to 36 ATP during aerobic respiration?

Accepted Answer

Fermentation does not utilize the citric acid cycle or electron transport chain

Question 17

Which of the following is the correct sequence of events during alcohol fermentation in yeast?

Accepted Answer

Glucose $$\rightarrow$$ Pyruvate $$\rightarrow$$ Acetaldehyde $$\rightarrow$$ Ethanol

Question 18

Which of the following would most likely occur if NAD$$^+$$ was not regenerated during fermentation?

Accepted Answer

Glycolysis would stop due to lack of NAD$$^+$$

Question 19

Which of the following is a common misconception about fermentation?

Accepted Answer

Fermentation produces large amounts of ATP

Cellular Respiration: Fermentation

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