$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + \text{energy}$$

Question 1

Which molecule acts as an electron carrier during cellular respiration, becoming reduced when it accepts electrons and a proton?

Accepted Answer

NAD+

Question 2

During glycolysis, which of the following is produced directly as a result of substrate-level phosphorylation?

Accepted Answer

ATP

Question 3

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

Accepted Answer

It synthesizes ATP from ADP and inorganic phosphate using the proton gradient.

Question 4

Which process directly uses oxygen as the final electron acceptor?

Accepted Answer

Electron transport chain

Question 5

In the context of cellular respiration, which equation correctly represents the overall reaction for aerobic respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy}$$

Question 6

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD$$^+$$ from NADH, allowing glycolysis to continue in the absence of oxygen.

Question 7

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

Accepted Answer

Photosynthesis

Question 8

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain. Which of the following would most likely be affected?

Accepted Answer

ATP synthesis via chemiosmosis

Question 9

Which of the following best explains why oxidative phosphorylation produces more ATP than substrate-level phosphorylation?

Accepted Answer

It involves the transfer of electrons to oxygen, creating a large proton gradient that drives ATP synthesis.

Question 10

Which molecule is reduced during the electron transport chain?

Accepted Answer

O$$_2$$

Question 11

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

Accepted Answer

Aerobic respiration produces more ATP per glucose molecule than fermentation.

Question 12

Which of the following best describes chemiosmosis?

Accepted Answer

The movement of protons down their concentration gradient through ATP synthase to generate ATP.

Question 13

Which of the following is an example of a redox reaction in cellular respiration?

Accepted Answer

Conversion of pyruvate to lactate

Question 14

If a cell's supply of NAD$$^+ is $$depleted, which process will be directly inhibited?

Accepted Answer

Glycolysis

Question 15

Which of the following statements about the relationship between molecular structure and oxidative energy yield is correct?

Accepted Answer

Molecules with more reduced carbon atoms yield more energy when oxidized.

Question 16

Which of the following is the correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis $$\rightarrow$$ Citric acid cycle $$\rightarrow$$ Electron transport chain

Question 17

Which of the following is a correct description of an oxidizing agent in a redox reaction?

Accepted Answer

It accepts electrons from another molecule.

Question 18

A muscle cell under anaerobic conditions will primarily produce which molecule to regenerate NAD$$^+$$?

Accepted Answer

Lactate

Question 19

Which of the following processes occurs in both prokaryotic and eukaryotic cells?

Accepted Answer

Glycolysis

Question 20

Which of the following statements best explains why oxygen is essential for aerobic respiration?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, allowing for the regeneration of NAD$$^+$$ and FAD.

Cellular Respiration and Energy Production: Key Concepts and Processes EOC CH 7 need to know slide

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