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

Question 1

Which of the following best describes the overall chemical equation for aerobic cellular respiration using glucose as the fuel?

Accepted Answer

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

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

What is the role of NAD$$^+ in $$cellular respiration?

Accepted Answer

It functions as an electron carrier, accepting electrons during redox reactions.

Question 4

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

Accepted Answer

Glycolysis

Question 5

In the absence of oxygen, which process allows cells to continue producing ATP?

Accepted Answer

Fermentation

Question 6

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

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 7

Why is oxygen required for aerobic cellular respiration?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain.

Question 8

Which of the following is a product of the citric acid cycle for each turn of the cycle?

Accepted Answer

1 ATP, 3 NADH, 1 FADH$$_2$$

Question 9

What is the net gain of ATP molecules produced by substrate-level phosphorylation during glycolysis?

Accepted Answer

2 ATP

Question 10

Which of the following best explains chemiosmosis in mitochondria?

Accepted Answer

The use of a proton (H$$^+) $$gradient to drive ATP synthesis via ATP synthase.

Question 11

Which molecule is regenerated during fermentation to allow glycolysis to continue?

Accepted Answer

NAD$$^+$$

Question 12

A patient is exposed to cyanide, which inhibits cytochrome c oxidase in mitochondria. What is the most immediate effect on cellular respiration?

Accepted Answer

The electron transport chain will halt, stopping ATP production by oxidative phosphorylation.

Question 13

Which of the following is TRUE about the energy yield from the complete oxidation of one glucose molecule in cellular respiration?

Accepted Answer

It produces up to about 32 ATP molecules, with the rest of the energy lost as heat.

Question 14

Which metabolic pathway is considered a 'metabolic heirloom' from early cells and is found in nearly all organisms?

Accepted Answer

Glycolysis

Question 15

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

Accepted Answer

Feedback inhibition slows down respiration when ATP levels are high.

Question 16

Which of the following is a correct comparison between fermentation and aerobic respiration?

Accepted Answer

Aerobic respiration produces about 32 ATP per glucose, while fermentation produces only 2 ATP per glucose.

Question 17

Which of the following is the final electron acceptor in the electron transport chain of aerobic respiration?

Accepted Answer

O$$_2$$

Question 18

Fatty acids are broken down by beta oxidation. What is the main product that enters the citric acid cycle?

Accepted Answer

Acetyl CoA

Question 19

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 20

A yeast cell is placed in an anaerobic environment. Which metabolic pathway will it use to generate ATP, and what are the main products?

Accepted Answer

Alcohol fermentation; ethanol and CO$$_2$$

Cellular Respiration and Fermentation: Catabolic Pathways and Energy Production

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