Q: Which of the following equations correctly represents the overall process of cellular respiration?

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

Question 1

Which of the following best describes the main purpose of cellular respiration in eukaryotic cells?

Accepted Answer

To break down glucose and generate ATP for cellular work

Question 2

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

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

Question 3

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Oxidative phosphorylation

Question 4

Which molecule acts as the final electron acceptor in the electron transport chain during aerobic respiration?

Accepted Answer

O$$_2$$

Question 5

What is the main difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP from a substrate, while oxidative phosphorylation uses a proton gradient and ATP synthase.

Question 6

Which of the following best describes the role of NAD$$^+ in $$cellular respiration?

Accepted Answer

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

Question 7

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

Accepted Answer

Fermentation

Question 8

Which of the following statements about glycolysis is TRUE?

Accepted Answer

It produces a net gain of 2 ATP molecules per glucose molecule.

Question 9

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

Accepted Answer

It is reduced to lactate.

Question 10

Which of the following best explains why fats yield more ATP per gram than carbohydrates during cellular respiration?

Accepted Answer

Fats are more reduced and contain more high-energy electrons.

Question 11

Which enzyme is the key regulatory point in glycolysis, and how is it regulated?

Accepted Answer

Phosphofructokinase; inhibited by high levels of ATP

Question 12

Which of the following is a correct description of a redox reaction in cellular respiration?

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 13

Why is the citric acid cycle considered a cycle?

Accepted Answer

The final product, oxaloacetate, is regenerated and used to combine with acetyl CoA to start the cycle again.

Question 14

Which of the following statements about the electron transport chain is FALSE?

Accepted Answer

It directly produces ATP by transferring electrons to ADP.

Question 15

What is the main function of fermentation?

Accepted Answer

To regenerate NAD$$^+ so $$glycolysis can continue

Question 16

Which of the following is a product of the citric acid cycle for each acetyl CoA that enters?

Accepted Answer

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

Question 17

Which of the following best explains why the exact number of ATP molecules generated from one molecule of glucose during cellular respiration cannot be stated?

Accepted Answer

Some protons leak across the mitochondrial membrane, and the electron transport chain can be used for other processes.

Question 18

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

Accepted Answer

Both processes use glycolysis to oxidize glucose.

Question 19

A patient is diagnosed with a mitochondrial disorder that impairs the function of ATP synthase. Which of the following would most likely be observed in this patient’s cells?

Accepted Answer

Decreased ATP production and accumulation of NADH

Cellular Respiration and Fermentation: Energy Production in Cells

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