Q: Which equation correctly represents the net ATP yield from aerobic cellular respiration per molecule of glucose?

$$30 \text{ ATP} + 6 \text{ CO}_2 + 6 \text{ H}_2\text{O}$$

Question 1

Which of the following best describes the process of reduction in cellular respiration?

Accepted Answer

The gain of electrons by a molecule, often accompanied by the addition of a hydrogen atom.

Question 2

During glycolysis, glucose is converted into which molecule, and where does this process occur?

Accepted Answer

Glucose is converted into pyruvate in the cytoplasm.

Question 3

Which equation correctly represents the net ATP yield from aerobic cellular respiration per molecule of glucose?

Accepted Answer

$$30 	ext{ ATP} + 6 	ext{ CO}_2 + 6 	ext{ H}_2	ext{O}$$

Question 4

Why is electron transport considered an efficient way to move electrons in the process of ATP synthesis?

Accepted Answer

It couples electron movement to the pumping of protons, creating a gradient used to synthesize ATP.

Question 5

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

Accepted Answer

Oxygen ($$	ext{O}_2)$$

Question 6

What is the main purpose of chemiosmosis in cellular respiration?

Accepted Answer

To use the proton gradient to drive the synthesis of ATP from ADP and inorganic phosphate.

Question 7

Which of the following best explains why ATP must be recycled during cellular respiration?

Accepted Answer

ATP is unstable and cannot be stored for long periods.

Question 8

In the absence of oxygen, what happens to pyruvate produced during glycolysis in animal cells?

Accepted Answer

It is converted into lactic acid.

Question 9

Which of the following is a key difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP, while oxidative phosphorylation uses a proton gradient to synthesize ATP.

Question 10

Which of the following best describes fermentation in yeast?

Accepted Answer

Conversion of pyruvate to ethanol and carbon dioxide.

Question 11

How does fatty acid metabolism compare to glucose metabolism in terms of ATP yield?

Accepted Answer

Fatty acid metabolism yields more ATP per molecule than glucose metabolism.

Question 12

Which of the following is a scientific rationale for the idea that glycolysis was an early event in evolution?

Accepted Answer

Glycolysis occurs in the cytoplasm and does not require membrane-bound organelles or oxygen.

Question 13

Which of the following is true about the role of cytochromes in the electron transport chain?

Accepted Answer

Cytochromes are proteins that transfer electrons between complexes in the electron transport chain.

Question 14

Why might ATP production be reduced in some instances to conserve energy, such as in hibernating animals?

Accepted Answer

Lower ATP production decreases metabolic rate, conserving energy during periods of low activity.

Question 15

Which equation represents the overall process of aerobic cellular respiration?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 30	ext{ATP}$$

Question 16

Which step in cellular respiration produces the most ATP?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 17

What is the main difference in the fate of NADH in aerobic versus anaerobic respiration?

Accepted Answer

In aerobic respiration, NADH donates electrons to the electron transport chain; in anaerobic respiration, NADH is used to reduce pyruvate.

Question 18

Which of the following is a real-world example of substrate-level phosphorylation?

Accepted Answer

ATP production during glycolysis.

Question 19

If a cell uses 2 ATP to start glycolysis and produces 4 ATP by the end of glycolysis, what is the net ATP gain?

Accepted Answer

$$2 	ext{ ATP}$$

Question 20

Which of the following molecules can be used as fuel to make ATP in addition to glucose?

Accepted Answer

Fatty acids, amino acids, and other carbohydrates

Cellular Respiration: Concepts, Mechanisms, and Applications

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