Q: Which of the following equations correctly represents the hydrolysis of ATP?

$$ATP \rightarrow ADP + Pi + \text{energy}$$

Question 1

Which of the following best describes the primary function of cellular respiration in human cells?

Accepted Answer

To convert nutrients into adenosine triphosphate (ATP), providing energy for cellular activities.

Question 2

During intense exercise, muscle cells may switch to anaerobic respiration. What is the main reason for this metabolic shift?

Accepted Answer

Oxygen supply cannot meet the increased energy demand, so cells rely on lactic acid fermentation to regenerate NAD	extsuperscript{+} and allow glycolysis to continue.

Question 3

Which of the following equations correctly represents the hydrolysis of ATP?

Accepted Answer

$$ATP ightarrow ADP + Pi + 	ext{energy}$$

Question 4

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

Accepted Answer

Oxygen ($$O_2)$$

Question 5

A patient with a mitochondrial disorder has impaired electron transport chain function. Which of the following consequences is most likely?

Accepted Answer

Decreased ATP production and accumulation of NADH and FADH$$_2$$

Question 6

Which of the following is a correct summary of the net ATP yield from one molecule of glucose during aerobic cellular respiration (as used in this course)?

Accepted Answer

$$36$$ ATP

Question 7

In the absence of oxygen, yeast cells convert glucose into which of the following products?

Accepted Answer

Ethanol, carbon dioxide, and ATP

Question 8

Which enzyme catalyzes the phosphorylation of glucose to glucose-6-phosphate in the first step of glycolysis?

Accepted Answer

Hexokinase

Question 9

A defect in the enzyme succinate dehydrogenase would most directly affect which stage of cellular respiration?

Accepted Answer

Krebs cycle (Citric Acid Cycle)

Question 10

Which of the following best explains why anaerobic respiration is less efficient than aerobic respiration?

Accepted Answer

Anaerobic respiration only produces ATP during glycolysis, yielding 2 ATP per glucose, while aerobic respiration uses the electron transport chain to generate up to 36 ATP per glucose.

Question 11

Which of the following is a direct product of the electron transport chain that is essential for maintaining cellular hydration and homeostasis?

Accepted Answer

Water ($$H_2O)$$

Question 12

Which molecule is regenerated during lactic acid fermentation, allowing glycolysis to continue in the absence of oxygen?

Accepted Answer

NAD	extsuperscript{+}

Question 13

A person is experiencing muscle fatigue after sprinting. Which metabolic process is primarily responsible for the accumulation of lactic acid in their muscles?

Accepted Answer

Lactic acid fermentation (anaerobic respiration)

Question 14

Which of the following best describes the role of ATP in nerve signaling?

Accepted Answer

ATP powers the sodium-potassium pump, maintaining ion gradients necessary for action potential generation.

Question 15

Which of the following is a correct summary of the net products per glucose molecule after glycolysis?

Accepted Answer

2 ATP, 2 NADH, and 2 pyruvate

Question 16

Which of the following best explains the importance of carbon dioxide ($$CO_2) $$removal from the body?

Accepted Answer

CO$$_2 is a $$byproduct of the Krebs cycle and must be removed to maintain acid-base balance and prevent acidosis.

Question 17

Which of the following best describes the fate of pyruvate in animal cells under anaerobic conditions?

Accepted Answer

It is converted to lactic acid to regenerate NAD	extsuperscript{+}.

Question 18

Which of the following is a key function of the liver related to cellular respiration and organ function?

Accepted Answer

Converting ammonia, a toxic byproduct of protein metabolism, into urea for excretion.

Question 19

Which of the following best explains why the brain is highly sensitive to changes in blood carbon dioxide ($$CO_2) $$levels?

Accepted Answer

CO$$_2$$ levels affect blood vessel diameter in the brain, altering blood flow and oxygen delivery.

Question 20

Which of the following best describes the role of the electron transport chain (ETC) in ATP production?

Accepted Answer

It uses high-energy electrons from NADH and FADH$$_2 to $$pump protons, creating a gradient that drives ATP synthesis via chemiosmosis.

Cellular Respiration and Organ Function: An Overview for Anatomy & Physiology

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