Question 1

Which enzyme is the rate-limiting step in the glycolysis pathway during exercise?

Accepted Answer

Phosphofructokinase

Question 2

During high-intensity, short-term exercise, which energy system is primarily responsible for ATP production?

Accepted Answer

ATP-PC (phosphagen) system

Question 3

What is the main effect of creatine supplementation on exercise performance?

Accepted Answer

It delays muscle fatigue by enhancing phosphocreatine stores.

Question 4

Which of the following is the correct net ATP yield from one molecule of glucose during aerobic metabolism?

Accepted Answer

$$32$$ ATP

Question 5

A person on a low-carbohydrate diet is running a marathon. What is the most likely physiological consequence if they do not consume glucose during the event?

Accepted Answer

They may experience 'hitting the wall' due to depleted blood glucose.

Question 6

Which process describes the conversion of lactate to glucose in the liver?

Accepted Answer

Gluconeogenesis (Cori Cycle)

Question 7

During beta oxidation, how many acetyl-CoA molecules are produced from the breakdown of a 16-carbon fatty acid?

Accepted Answer

$$8$$ acetyl-CoA

Question 8

Which of the following is a direct product of the Krebs cycle that is used in the electron transport chain for ATP synthesis?

Accepted Answer

NADH

Question 9

What is the role of cytochrome oxidase in aerobic metabolism?

Accepted Answer

It is the rate-limiting enzyme in the electron transport chain.

Question 10

Which hormone increases lipolysis during prolonged exercise?

Accepted Answer

Epinephrine

Question 11

If a muscle cell is deprived of oxygen, which metabolic pathway will predominate for ATP production?

Accepted Answer

Anaerobic glycolysis

Question 12

Which of the following is the correct ATP yield from one NADH molecule passing through the electron transport chain?

Accepted Answer

$$2.5$$ ATP

Question 13

Which of the following is NOT a fuel source that can be converted to acetyl-CoA for entry into the Krebs cycle?

Accepted Answer

Lactate

Question 14

What is the primary function of the Krebs cycle in cellular respiration?

Accepted Answer

To complete oxidation of fuel molecules and generate hydrogen ions for oxidative phosphorylation

Question 15

Which of the following statements best describes the chemiosmotic hypothesis in the electron transport chain?

Accepted Answer

ATP is synthesized as hydrogen ions flow through ATP synthase due to a proton gradient across the inner mitochondrial membrane.

Question 16

A vegetarian athlete is considering creatine supplementation. Which statement is most accurate regarding their potential benefit?

Accepted Answer

They may benefit more than omnivores because plant foods have low creatine levels.

Question 17

Which of the following is the correct sequence for the conversion of pyruvate to acetyl-CoA?

Accepted Answer

Pyruvate enters the mitochondrial matrix and is converted to acetyl-CoA, producing $$CO_2$$ and $$NADH + H^+.$$

Question 18

Which of the following is a product of lipolysis in adipose tissue?

Accepted Answer

Glycerol and free fatty acids

Question 19

During prolonged exercise, which fuel source becomes increasingly important for ATP production?

Accepted Answer

Fatty acids

Question 20

Which of the following statements about the electron transport chain is correct?

Accepted Answer

It produces ATP by transferring electrons from NADH and FADH$$_2 to $$oxygen.

Bioenergetics and Aerobic ATP Production: Physiology of Exercise

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