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

$$\text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \rightarrow 6 \text{CO}_2 + 6 \text{H}_2\text{O} + \text{Energy}$$

Question 1

Which of the following best describes the role of oxygen (O$$_2) in $$cellular respiration?

Accepted Answer

O$$_2 is $$the final electron acceptor in the electron transport chain, forming H$$_2O.$$

Question 2

During glycolysis, what is the net gain of ATP and NADH molecules per molecule of glucose?

Accepted Answer

2 ATP and 2 NADH

Question 3

A patient is diagnosed with a mitochondrial disorder that impairs the function of ATP synthase. Which process would be most directly affected?

Accepted Answer

Chemiosmotic production of ATP during oxidative phosphorylation

Question 4

Which of the following statements about redox reactions in cellular respiration is correct?

Accepted Answer

Glucose is oxidized and O$$_2 is $$reduced.

Question 5

In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of:

Accepted Answer

Ethanol and CO$$_2$$

Question 6

Which of the following best explains why fats yield more ATP per gram than carbohydrates during cellular respiration?

Accepted Answer

Fats have more hydrogen atoms, providing more high-energy electrons for the electron transport chain.

Question 7

A researcher adds a chemical that blocks the transfer of electrons from NADH to the electron transport chain. What immediate effect will this have on ATP production?

Accepted Answer

ATP production by oxidative phosphorylation will decrease significantly.

Question 8

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

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6 	ext{O}_2 ightarrow 6 	ext{CO}_2 + 6 	ext{H}_2	ext{O} + 	ext{Energy}$$

Question 9

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

Accepted Answer

Fermentation produces less ATP per glucose molecule than aerobic respiration.

Question 10

A mutation causes a cell to lack the enzyme pyruvate dehydrogenase. Which process would be directly impaired?

Accepted Answer

Conversion of pyruvate to acetyl CoA before the citric acid cycle

Question 11

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

Accepted Answer

It involves the direct transfer of a phosphate group from a substrate to ADP.

Question 12

In lactic acid fermentation, which molecule acts as the final electron acceptor?

Accepted Answer

Pyruvate

Question 13

Which of the following best explains why the exact number of ATP molecules produced from one glucose molecule during cellular respiration is not always the same?

Accepted Answer

The coupling between electron transport and ATP synthesis is not always 1:1, and the proton-motive force can be used for other work.

Question 14

A facultative anaerobe is placed in an environment with no oxygen but plenty of glucose. Which pathway will it primarily use to generate ATP?

Accepted Answer

Fermentation

Question 15

Which of the following is a correct sequence of energy flow during cellular respiration?

Accepted Answer

glucose $$\rightarrow$$ NADH $$\rightarrow$$ electron transport chain $$\rightarrow$$ proton-motive force $$\rightarrow$$ ATP

Question 16

Which of the following is NOT a product of the citric acid cycle (per turn)?

Accepted Answer

2 Pyruvate

Question 17

A person is on a high-protein, low-carbohydrate diet. Which process must occur before amino acids can be used for energy in cellular respiration?

Accepted Answer

Deamination

Question 18

Which of the following best describes the function of NAD$$^+ in $$cellular respiration?

Accepted Answer

It acts as an oxidizing agent, accepting electrons during redox reactions.

Question 19

If a cell is exposed to cyanide, which blocks the transfer of electrons to O$$_2 in $$the electron transport chain, what will be the immediate consequence?

Accepted Answer

Electron transport will stop, and no further ATP will be produced by oxidative phosphorylation.

Question 20

Which of the following is an example of feedback inhibition in cellular respiration?

Accepted Answer

ATP inhibits an early enzyme in glycolysis when ATP levels are high.

Cellular Respiration: Pathways, Mechanisms, and Regulation

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