Q: Which equation correctly represents the overall reaction for aerobic cellular respiration using glucose?

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

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

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 3

Which equation correctly represents the overall reaction for aerobic cellular respiration using glucose?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy (ATP + heat)}$$

Question 4

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

Accepted Answer

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

Question 5

Which process produces the majority of ATP during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 6

In the electron transport chain, what is the primary purpose of pumping protons (H+) across the mitochondrial membrane?

Accepted Answer

To create a proton-motive force that drives ATP synthesis via chemiosmosis

Question 7

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 to form ATP.

Question 8

What is the fate of pyruvate in human muscle cells under anaerobic conditions?

Accepted Answer

It is reduced to lactate by NADH, regenerating NAD+.

Question 9

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

Accepted Answer

Fermentation uses an organic molecule as the final electron acceptor, while aerobic respiration uses oxygen.

Question 10

A patient is diagnosed with a genetic defect that prevents the formation of NADH during glycolysis. Which cellular process would be most directly affected?

Accepted Answer

The transfer of electrons to the electron transport chain

Question 11

Which of the following molecules is produced as a waste product during the citric acid cycle?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 12

Why does the oxidation of a gram of fat yield more ATP than the oxidation of a gram of carbohydrate?

Accepted Answer

Fatty acids have more high-energy electrons and hydrogen atoms available for transfer to NAD+ and FAD.

Question 13

Which enzyme catalyzes the conversion of pyruvate to acetyl CoA before entry into the citric acid cycle?

Accepted Answer

Pyruvate dehydrogenase

Question 14

In alcohol fermentation, what are the final products formed from glucose?

Accepted Answer

Ethanol, carbon dioxide, and NAD+

Question 15

Which of the following best explains why glycolysis is considered a universal metabolic pathway?

Accepted Answer

It occurs in the cytoplasm and does not require oxygen, making it possible in both prokaryotes and eukaryotes.

Question 16

Which statement about chemiosmosis in mitochondria is correct?

Accepted Answer

Chemiosmosis uses the energy of a proton gradient to drive the synthesis of ATP via ATP synthase.

Question 17

A facultative anaerobe is an organism that:

Accepted Answer

Can survive using either fermentation or aerobic respiration depending on oxygen availability.

Question 18

Which of the following is a direct result of feedback inhibition in cellular respiration?

Accepted Answer

The activity of key enzymes is regulated to prevent wasteful ATP production.

Question 19

During oxidative phosphorylation, which molecule donates electrons to the electron transport chain?

Accepted Answer

NADH and FADH$$_2$$

Question 20

Which of the following is true regarding the energy yield from cellular respiration?

Accepted Answer

About 32 ATP are produced per glucose molecule, with the rest of the energy lost as heat.

Cellular Respiration and Fermentation: Catabolic Pathways for Energy Production

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