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

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

Question 1

Which of the following best describes the role of oxygen in cellular respiration?

Accepted Answer

Oxygen is the final electron acceptor in the electron transport chain, forming water.

Question 2

During the oxidation of glucose in cellular respiration, which molecule is reduced?

Accepted Answer

Oxygen

Question 3

Which equation correctly represents the overall process of aerobic cellular respiration?

Accepted Answer

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

Question 4

Which process in cellular respiration produces the most ATP?

Accepted Answer

Oxidative phosphorylation

Question 5

What is the main purpose of fermentation in the absence of oxygen?

Accepted Answer

To regenerate $$\mathrm{NAD}^+ so $$glycolysis can continue

Question 6

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

Accepted Answer

The reducing agent donates electrons and becomes oxidized.

Question 7

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

Accepted Answer

2 ATP and 2 NADH

Question 8

Which enzyme catalyzes the conversion of pyruvate to acetyl CoA, and what are the products of this reaction?

Accepted Answer

Pyruvate dehydrogenase; acetyl CoA, $$\mathrm{CO}_2$$, and NADH

Question 9

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 10

A poison that blocks the function of ATP synthase would directly affect which process?

Accepted Answer

The movement of protons down their gradient to generate ATP

Question 11

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by the transfer of a phosphate group from a substrate to ADP by an enzyme.

Question 12

Which of the following is NOT a product of the citric acid cycle for each turn?

Accepted Answer

Pyruvate

Question 13

In the electron transport chain, what is the main function of the cytochrome proteins?

Accepted Answer

To transfer electrons between carriers and facilitate the release of energy

Question 14

Which of the following best describes the evolutionary significance of glycolysis?

Accepted Answer

It is the most widespread and ancient metabolic pathway, functioning in both aerobic and anaerobic conditions.

Question 15

A patient is diagnosed with a genetic disorder that prevents the removal of amino groups from amino acids. Which process would be directly affected?

Accepted Answer

Deamination during protein catabolism

Question 16

Which of the following statements about feedback inhibition in cellular respiration is correct?

Accepted Answer

High levels of ATP inhibit phosphofructokinase, slowing glycolysis.

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

Pyruvate

Question 19

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

Accepted Answer

The proton-motive force is also used for other cellular work, and the coupling between electron transport and ATP synthesis is not always exact.

Question 20

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

Accepted Answer

Production of cheese and yogurt by lactic acid fermentation

Cellular Respiration and Fermentation: Chapter 9 Study Guide

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