Question 1

Which of the following best describes the role of negative feedback in homeostatic control during exercise?

Accepted Answer

It reverses the initial disturbance to restore internal stability.

Question 2

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

Accepted Answer

ATP-PCR system

Question 3

Which of the following is a correct example of a coupled reaction in cellular metabolism?

Accepted Answer

Energy released from an exergonic reaction powers an endergonic reaction.

Question 4

A molecule loses an electron during a metabolic reaction. According to the study materials, what has occurred?

Accepted Answer

The molecule has been oxidized.

Question 5

Which of the following is NOT a factor that induces the synthesis of stress proteins during exercise?

Accepted Answer

Stable pH levels

Question 6

Which process describes the breakdown of triglycerides into glycerol and fatty acids in muscle tissue?

Accepted Answer

Lipolysis

Question 7

What is the net ATP gain from glycolysis when starting with one molecule of glucose?

Accepted Answer

$$2$$

Question 8

Which enzyme catalyzes the conversion of phosphocreatine and ADP to creatine and ATP in the ATP-PCR system?

Accepted Answer

Creatine kinase

Question 9

During moderate-intensity aerobic exercise, which fuel source predominates for ATP production?

Accepted Answer

Glucose/glycogen

Question 10

Which of the following statements about enzymes is TRUE?

Accepted Answer

Enzymes accelerate chemical reactions without being changed.

Question 11

If a person is exercising in a hot climate and their body temperature rises, which feedback mechanism is most likely to be activated to restore homeostasis?

Accepted Answer

Negative feedback

Question 12

Which of the following best describes the process of gluconeogenesis?

Accepted Answer

Synthesis of glucose from non-carbohydrate sources

Question 13

Which of the following is the correct formula for the ATP-PCR reaction catalyzed by creatine kinase?

Accepted Answer

$$\mathrm{PCr} + \mathrm{ADP} \rightarrow \mathrm{ATP} + \mathrm{Cr}$$

Question 14

Which of the following is TRUE regarding the end products of glycolysis under anaerobic conditions?

Accepted Answer

Lactate is produced from pyruvate.

Question 15

Which of the following is a plausible benefit of creatine supplementation for athletes?

Accepted Answer

Enhanced performance in short-term, high-intensity activities

Question 16

Which of the following statements about metabolic reactions is correct?

Accepted Answer

Catabolic reactions break down molecules.

Question 17

Which of the following is the most basic unit of energy in biological systems?

Accepted Answer

Adenosine Triphosphate (ATP)

Question 18

Which of the following is TRUE about oxidation-reduction reactions in metabolism?

Accepted Answer

Oxidation and reduction are always coupled reactions.

Question 19

Which of the following is the correct sequence for the breakdown of glucose during aerobic exercise?

Accepted Answer

Glycolysis $$\rightarrow$$ Pyruvate $$\rightarrow$$ Acetyl-CoA $$\rightarrow$$ Krebs Cycle

Question 20

Which of the following is NOT a function of the cell membrane (sarcolemma) in muscle cells?

Accepted Answer

Contains genes that regulate protein synthesis

Physiology of Exercise: Foundations and Cellular Mechanisms

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