Q: Which of the following equations correctly summarizes the overall process of aerobic cellular respiration?

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} \rightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + \text{energy (ATP)}$$

Question 1

Which of the following best describes the role of the proton-motive force in cellular respiration?

Accepted Answer

It is used to drive the synthesis of ATP by ATP synthase through chemiosmosis.

Question 2

During the complete oxidation of one molecule of glucose in eukaryotic cells, what is the maximum net yield of ATP?

Accepted Answer

$$30$$

Question 3

Which enzyme complex catalyzes the oxidative decarboxylation of pyruvate to acetyl-CoA?

Accepted Answer

Pyruvate dehydrogenase

Question 4

Fatty acids are broken down to acetyl-CoA by which metabolic process?

Accepted Answer

Beta-oxidation

Question 5

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD$$^+ so $$glycolysis can continue in the absence of oxygen.

Question 6

In the electron transport chain, what is the final electron acceptor in aerobic respiration?

Accepted Answer

O$$_2$$

Question 7

Which of the following best explains why the citric acid cycle is considered a cycle?

Accepted Answer

The final product, oxaloacetate, is regenerated and used to combine with acetyl-CoA to start the cycle again.

Question 8

A patient has a genetic defect that impairs the function of ATP synthase. Which process would be most directly affected?

Accepted Answer

The production of ATP from ADP and P$$_i$$ during chemiosmosis

Question 9

Which of the following is a direct product of the citric acid cycle per glucose molecule?

Accepted Answer

$$6$$ NADH

Question 10

If a cell is deprived of oxygen, which process will continue to function?

Accepted Answer

Glycolysis

Question 11

Which of the following best describes the chemiosmosis hypothesis?

Accepted Answer

ATP is synthesized as protons flow down their electrochemical gradient through ATP synthase.

Question 12

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

Accepted Answer

Alcohol fermentation produces ethanol and CO$$_2$$, while lactic acid fermentation produces lactate and no CO$$_2.$$

Question 13

Which of the following equations correctly summarizes the overall process of aerobic cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} ightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + 	ext{energy (ATP)}$$

Question 14

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

Accepted Answer

Fermentation does not fully oxidize glucose, so less energy is extracted.

Question 15

Which molecule is both a product of glycolysis and a substrate for the citric acid cycle (after processing)?

Accepted Answer

Pyruvate

Question 16

A mutation prevents the formation of the electrochemical gradient across the inner mitochondrial membrane. Which process would be most directly impaired?

Accepted Answer

ATP synthesis by ATP synthase

Question 17

Which of the following is a common feature of both cellular respiration and fermentation?

Accepted Answer

Both begin with glycolysis, producing pyruvate and ATP.

Question 18

In which cellular compartment does pyruvate processing occur in eukaryotic cells?

Accepted Answer

Mitochondrial matrix

Question 19

Which of the following best describes the fate of NADH produced during glycolysis under anaerobic conditions?

Accepted Answer

It is oxidized back to NAD$$^+$$ during fermentation.

Cellular Respiration & Fermentation: Mechanisms of ATP Production in Cells

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