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

Question 1

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

O$$_2$$

Question 2

Which of the following best describes the role of NADH in cellular respiration?

Accepted Answer

It acts as an electron carrier, donating electrons to the electron transport chain.

Question 3

If a muscle cell is deprived of oxygen during intense exercise, which process will primarily generate ATP?

Accepted Answer

Lactic acid fermentation

Question 4

Which step in cellular respiration produces the greatest number of ATP molecules per glucose?

Accepted Answer

Oxidative phosphorylation

Question 5

What is the net ATP gain from glycolysis per molecule of glucose?

Accepted Answer

$$2$$ ATP

Question 6

Which vitamin is required for the synthesis of FAD, a coenzyme used in the citric acid cycle?

Accepted Answer

Vitamin B$$_2 ($$riboflavin)

Question 7

A cell is undergoing aerobic respiration. Which of the following is the correct sequence of major metabolic pathways?

Accepted Answer

Glycolysis → Pyruvate Oxidation → Citric Acid Cycle → Oxidative Phosphorylation

Question 8

If oxygen is not available, what is the fate of pyruvate in yeast cells?

Accepted Answer

It is converted to ethanol and CO$$_2.$$

Question 9

Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{Energy}$$

Question 10

Which process is responsible for the majority of heat loss during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 11

A patient is diagnosed with a deficiency in Vitamin B$$_3 ($$niacin). Which step of cellular respiration would be most directly affected?

Accepted Answer

Formation of NAD$$^+$$, impacting glycolysis and the citric acid cycle

Question 12

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD$$^+.$$

Question 13

In the absence of oxygen, muscle cells convert pyruvate into which molecule to allow continued ATP production?

Accepted Answer

Lactate

Question 14

Which of the following is NOT an input required for the citric acid cycle?

Accepted Answer

Glucose

Question 15

A cell is unable to transport pyruvate into the mitochondria. Which process will be directly impaired?

Accepted Answer

Pyruvate oxidation

Question 16

Which of the following best explains why cellular respiration is considered an efficient process compared to combustion of glucose in a laboratory?

Accepted Answer

Cellular respiration captures a significant portion of energy as ATP rather than releasing it all as heat.

Question 17

Which control mechanism helps regulate the rate of glycolysis in response to cellular ATP levels?

Accepted Answer

Feedback inhibition by ATP on phosphofructokinase

Question 18

Which of the following nutrients can be used to drive cellular respiration if glucose is not available?

Accepted Answer

Proteins, fats, and carbohydrates

Question 19

If a cell's mitochondria are damaged and unable to function, which process will still occur to produce ATP?

Accepted Answer

Glycolysis

Question 20

Which of the following is a direct output of the citric acid cycle?

Accepted Answer

NADH

Cellular Respiration and Energy Production in the Cell

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