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

Question 1

Which of the following best describes the overall equation for 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 2

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 3

Which molecule acts as the final electron acceptor in aerobic cellular respiration?

Accepted Answer

$$	ext{O}_2$$

Question 4

What is the main purpose of NAD+ in cellular respiration?

Accepted Answer

To temporarily store high-energy electrons before transferring them to the electron transport chain

Question 5

Which process occurs in the cytosol and does not require oxygen?

Accepted Answer

Glycolysis

Question 6

In the context of redox reactions, which statement is correct?

Accepted Answer

The oxidizing agent is reduced during the reaction.

Question 7

Which of the following best explains why energy is harvested in a stepwise manner during cellular respiration?

Accepted Answer

To prevent the cell from overheating due to a sudden release of energy

Question 8

What is the net gain of ATP molecules produced directly by glycolysis from one molecule of glucose?

Accepted Answer

2 ATP

Question 9

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

Accepted Answer

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

Question 10

Why is oxygen considered the most effective final electron acceptor in cellular respiration?

Accepted Answer

It is the most electronegative molecule available, allowing for maximum energy extraction from electrons.

Question 11

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactate

Question 12

In alcohol fermentation, what is the final electron acceptor?

Accepted Answer

Acetaldehyde

Question 13

Which of the following best describes the role of ATP synthase in cellular respiration?

Accepted Answer

It uses the proton motive force to synthesize ATP from ADP and inorganic phosphate.

Question 14

Which of the following statements about the flexibility of catabolic pathways is correct?

Accepted Answer

Proteins, fats, and other carbohydrates can enter cellular respiration at various points.

Question 15

What is the main reason why the actual ATP yield from cellular respiration is often less than the theoretical maximum?

Accepted Answer

Some protons are used for other cellular work, and shuttle efficiency is not perfect.

Question 16

Which of the following is NOT a product of aerobic cellular respiration?

Accepted Answer

Ethanol

Question 17

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that releases energy and has $$\Delta G \u003c 0$$

Question 18

In the context of the energy flow in ecosystems, which of the following is TRUE?

Accepted Answer

ATP produced by mitochondria powers most cellular work.

Question 19

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD+.

Question 20

Which of the following is a key regulatory mechanism in cellular respiration?

Accepted Answer

ATP inhibits the breakdown of glucose through feedback inhibition.

Cellular Respiration and Fermentation: Chapter 9 Study Notes

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