Question 1

Which of the following best describes the primary function of cellular respiration?

Accepted Answer

To convert organic molecules into ATP, the main energy currency of the cell.

Question 2

Where in the mitochondrion does the electron transport chain (ETC) occur?

Accepted Answer

On the inner mitochondrial membrane.

Question 3

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

Accepted Answer

Glycolysis → Pyruvate Oxidation → Citric Acid Cycle → Electron Transport Chain

Question 4

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

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 5

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

Accepted Answer

O$$_2$$

Question 6

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

Accepted Answer

The synthesis of ATP from ADP and inorganic phosphate

Question 7

Which of the following best explains why lactic acid fermentation occurs in human muscle cells during intense exercise?

Accepted Answer

Oxygen is limited, so cells regenerate NAD$$^+ by $$reducing pyruvate to lactic acid.

Question 8

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

Accepted Answer

$$2 CO$_2$$, $$3$$ NADH, $$1$$ FADH$$_2$$, $$1$$ ATP (or GTP)

Question 9

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

Accepted Answer

Electron Transport Chain and Chemiosmosis

Question 10

Which of the following statements about beta-oxidation is correct?

Accepted Answer

It occurs in the mitochondrial matrix and produces acetyl-CoA from fatty acids.

Question 11

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

Accepted Answer

It acts as an electron carrier, accepting electrons during glycolysis and the citric acid cycle.

Question 12

A patient is diagnosed with a mitochondrial disorder that reduces the surface area of the inner mitochondrial membrane. Which process would be most directly affected?

Accepted Answer

Electron Transport Chain

Question 13

Which of the following is NOT a product of alcoholic fermentation?

Accepted Answer

Lactic acid

Question 14

Which enzyme catalyzes the phosphorylation of glucose in the first step of glycolysis?

Accepted Answer

Hexokinase

Question 15

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

Accepted Answer

Fats are more reduced and have more high-energy electrons for the electron transport chain.

Question 16

Which of the following is a regulatory enzyme in glycolysis that is allosterically inhibited by ATP?

Accepted Answer

Phosphofructokinase

Question 17

Which of the following statements about oxidative deamination is correct?

Accepted Answer

It occurs in the liver and removes amino groups from amino acids.

Question 18

Which of the following best describes the chemiosmotic mechanism for ATP synthesis?

Accepted Answer

ATP is synthesized as protons flow down their gradient through ATP synthase.

Question 19

Which of the following is the main reason why proteins are not the cell's primary energy source?

Accepted Answer

Proteins are primarily used for building and repairing tissues.

Cellular Respiration and Alternative Energy Sources: Structured Study Notes

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