Q: Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

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

Question 1

Which of the following best describes what happens to glucose during aerobic cellular respiration?

Accepted Answer

Glucose is oxidized to carbon dioxide, releasing energy used to produce ATP.

Question 2

In a redox reaction, which of the following statements is TRUE?

Accepted Answer

The molecule that gains electrons is reduced.

Question 3

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

O$$_2$$

Question 4

Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

Accepted Answer

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

Question 5

Which process is responsible for the majority of ATP production during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 6

A patient is unable to efficiently transfer electrons from NADH to the electron transport chain. Which stage of cellular respiration would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Question 7

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

Accepted Answer

Oxygen acts as the final electron acceptor, allowing the electron transport chain to function.

Question 8

Which of the following statements about NAD$$^+ is $$correct?

Accepted Answer

NAD$$^+ is $$the oxidized form that accepts electrons during redox reactions.

Question 9

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

Accepted Answer

2 ATP and 2 NADH

Question 10

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 11

A cell is placed in an environment lacking oxygen. Which pathway will the cell most likely use to generate ATP?

Accepted Answer

Fermentation

Question 12

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

Accepted Answer

Glycolysis $$\rightarrow$$ Citric acid cycle $$\rightarrow$$ Oxidative phosphorylation

Question 13

If a poison blocks the function of ATP synthase, which process will be directly inhibited?

Accepted Answer

The production of ATP from ADP and P$$_i$$ during oxidative phosphorylation

Question 14

Which of the following best explains why glucose is considered the most efficient energy source for cells?

Accepted Answer

Glucose can be completely oxidized to CO$$_2$$ and H$$_2O$$, releasing a large amount of energy.

Question 15

Which of the following is a real-life example of a redox reaction relevant to cellular respiration?

Accepted Answer

The transfer of electrons from NADH to the electron transport chain

Question 16

A mutation causes a cell to be unable to regenerate NAD$$^+. $$What is the most immediate consequence for glycolysis?

Accepted Answer

Glycolysis will slow down and eventually stop due to lack of NAD$$^+ to $$accept electrons.

Question 17

Which of the following best describes the role of dehydrogenase enzymes in cellular respiration?

Accepted Answer

They remove electrons and protons from substrates, transferring them to NAD$$^+ or $$FAD.

Question 18

If a cell is forced to rely solely on fermentation for ATP production, which of the following is most likely to occur?

Accepted Answer

The cell will produce less ATP and generate lactate or ethanol as byproducts.

Question 19

Which of the following statements about the electron transport chain (ETC) is correct?

Accepted Answer

The ETC creates a proton gradient that drives ATP synthesis via ATP synthase.

Cellular Respiration and Redox Reactions: Principles and Pathways

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