Question 1

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

Accepted Answer

To break down glucose and other molecules to produce ATP for cellular work

Question 2

Which equation correctly represents aerobic cellular respiration?

Accepted Answer

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

Question 3

During aerobic respiration, where does the majority of ATP production occur?

Accepted Answer

In the mitochondria during oxidative phosphorylation

Question 4

Which of the following statements about anaerobic respiration is correct?

Accepted Answer

It evolved before aerobic respiration

Question 5

A muscle cell is working hard during intense exercise and oxygen is limited. Which pathway will it most likely use to generate ATP?

Accepted Answer

Lactate fermentation in the cytoplasm

Question 6

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

Accepted Answer

Glycolysis → Krebs cycle → Oxidative phosphorylation

Question 7

If a cell is deprived of oxygen, which process will be directly inhibited?

Accepted Answer

Krebs cycle

Question 8

Which of the following is a product of glycolysis?

Accepted Answer

Pyruvate

Question 9

A yeast cell is placed in an anaerobic environment. Which end product will it most likely produce from glucose metabolism?

Accepted Answer

Ethanol

Question 10

Which of the following best explains why aerobic respiration yields more ATP than anaerobic respiration?

Accepted Answer

Oxygen acts as the final electron acceptor, allowing complete oxidation of glucose

Question 11

In the absence of oxygen, what is the net ATP yield per molecule of glucose during glycolysis?

Accepted Answer

$$2$$ ATP

Question 12

Which molecule is oxidized to form Acetyl-CoA before entering the Krebs cycle?

Accepted Answer

Pyruvate

Question 13

Which of the following is NOT a product of aerobic respiration?

Accepted Answer

Oxygen

Question 14

A patient’s muscle cells are found to have defective mitochondria. Which process will be most directly affected?

Accepted Answer

Krebs cycle

Question 15

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

Accepted Answer

It carries electrons from glycolysis and the Krebs cycle to the electron transport chain

Question 16

Which step of cellular respiration produces the most ATP?

Accepted Answer

Oxidative phosphorylation

Question 17

Which of the following is a key difference between alcoholic fermentation and lactate fermentation?

Accepted Answer

Alcoholic fermentation produces ethanol and carbon dioxide, while lactate fermentation produces lactate

Question 18

A scientist measures the ATP yield from the complete aerobic breakdown of one glucose molecule. What is the typical total ATP yield?

Accepted Answer

$$32$$ ATP

Question 19

Which of the following best explains why glycolysis is considered an ancient metabolic pathway?

Accepted Answer

It occurs in the cytoplasm and does not require oxygen

Question 20

If a person consumes a meal high in protein, which process allows their cells to use amino acids for ATP production?

Accepted Answer

Amino acids are deaminated and their carbon skeletons enter the Krebs cycle

Cellular Respiration: How Cells Release Stored Energy

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