Question 1

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

Accepted Answer

To break down glucose and generate ATP for cellular work

Question 2

During strenuous exercise, when a person's muscles exceed their aerobic capacity, what process do the muscle cells switch to and what is a major by-product?

Accepted Answer

Anaerobic metabolism; lactic acid

Question 3

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

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 ightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + 	ext{ATP}$$

Question 4

Which stage of cellular respiration occurs in the cytoplasm of the cell?

Accepted Answer

Glycolysis

Question 5

What is the primary role of oxygen in cellular respiration?

Accepted Answer

To act as the final electron acceptor in the electron transport chain

Question 6

A plant cell is exposed to sunlight and takes in $$\mathrm{CO}_2$$ and $$\mathrm{H}_2O. $$Which process is occurring, and what is a major by-product?

Accepted Answer

Photosynthesis; $$\mathrm{O}_2$$

Question 7

Which of the following statements about glycolysis is TRUE?

Accepted Answer

It produces a net gain of 2 ATP per glucose molecule

Question 8

In the citric acid cycle, what happens to the carbon atoms from acetic acid?

Accepted Answer

They are released as $$\mathrm{CO}_2$$

Question 9

Which of the following best explains why plants and animals both perform cellular respiration?

Accepted Answer

Both need to convert chemical energy in food into ATP

Question 10

A yeast cell is placed in an environment without oxygen. Which process will it use to generate ATP, and what are the likely by-products?

Accepted Answer

Fermentation; ethyl alcohol and $$\mathrm{CO}_2$$

Question 11

Which of the following is a correct sequence of events for the flow of electrons during cellular respiration?

Accepted Answer

Glucose $$\rightarrow$$ NADH $$\rightarrow$$ electron transport chain $$\rightarrow$$ oxygen

Question 12

Which of the following is a plausible explanation for why glycolysis is considered an ancient metabolic pathway?

Accepted Answer

It occurs in almost all organisms and does not require membrane-bound organelles

Question 13

A patient is unable to accumulate lactic acid in their muscles. Based on current scientific evidence, what is the most likely outcome during intense exercise?

Accepted Answer

Their muscles will fatigue more rapidly

Question 14

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

Accepted Answer

It uses the energy from a proton gradient to synthesize ATP from ADP and $$\mathrm{P}_i$$

Question 15

If a cell is deprived of oxygen, which stage of cellular respiration will be directly halted?

Accepted Answer

Electron transport chain

Question 16

Which of the following is a real-world example of chemical cycling in the biosphere?

Accepted Answer

A fox eats a rabbit, and the carbon in the rabbit is released as $$\mathrm{CO}_2$$ during cellular respiration

Question 17

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD+

Question 18

Which of the following is a direct input for the citric acid cycle?

Accepted Answer

Acetyl CoA

Question 19

Which of the following best explains why the inner mitochondrial membrane is highly folded?

Accepted Answer

To provide a large surface area for electron transport chains and ATP synthase

Question 20

Which of the following is a correct statement about the fate of food molecules in cellular respiration?

Accepted Answer

Carbohydrates, fats, and proteins can all enter the citric acid cycle after appropriate modification

Cellular Respiration: Obtaining Energy from Food

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