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

Question 1

Which statement best describes the role of the Sun in terrestrial metabolism?

Accepted Answer

The Sun is the primary source of energy for all metabolic processes on Earth.

Question 2

Which of the following is a correct description of an enzyme?

Accepted Answer

Enzymes are biological catalysts that increase the rate of a reaction by lowering the activation energy.

Question 3

During the postprandial (fed) state, which organ is primarily responsible for converting excess glucose into glycogen?

Accepted Answer

Liver

Question 4

Which hormone is secreted by the pancreas in response to elevated blood glucose levels after a meal?

Accepted Answer

Insulin

Question 5

What is the main metabolic pathway for energy production during the post-absorptive (fasted) state?

Accepted Answer

Fatty acid oxidation

Question 6

Which of the following statements about catabolism and anabolism is correct?

Accepted Answer

Anabolism is the process of synthesizing complex molecules, while catabolism breaks them down to release energy.

Question 7

Which equation correctly represents the hydrolysis of ATP to release energy?

Accepted Answer

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

Question 8

Which metabolic process is responsible for the conversion of amino acids to glucose during fasting?

Accepted Answer

Gluconeogenesis

Question 9

Why can't acetyl-CoA be converted to glucose during prolonged fasting?

Accepted Answer

The conversion of acetyl-CoA to glucose is not thermodynamically favorable.

Question 10

Which of the following is a major function of ATP in cellular metabolism?

Accepted Answer

ATP provides energy for biosynthesis, muscle contraction, and active ion transport.

Question 11

During the extended fast (starvation), which fuel source does the brain primarily adapt to use?

Accepted Answer

Ketone bodies

Question 12

Which process is responsible for the breakdown of triglycerides into fatty acids during fasting?

Accepted Answer

Lipolysis

Question 13

Which vitamin deficiency is associated with scurvy?

Accepted Answer

Vitamin C

Question 14

What is the primary metabolic fate of glucose in red blood cells?

Accepted Answer

Conversion to lactate via glycolysis

Question 15

Which hormone stimulates the hydrolysis of triglycerides in adipose tissue during fasting?

Accepted Answer

Glucagon

Question 16

Which metabolic pathway is upregulated in the liver during the post-absorptive state to maintain blood glucose levels?

Accepted Answer

Glycogenolysis

Question 17

Which of the following is a correct statement about metabolic homeostasis?

Accepted Answer

Homeostasis requires coordination between multiple organ systems and metabolic pathways.

Question 18

Which process is responsible for the detoxification of ammonia produced during amino acid deamination?

Accepted Answer

Urea cycle

Question 19

Which of the following is a thermodynamically favorable process in metabolism?

Accepted Answer

Conversion of glucose to ATP via glycolysis and the TCA cycle

Question 20

Which metabolic pathway is primarily responsible for the synthesis of ketone bodies during prolonged fasting?

Accepted Answer

Ketogenesis

Overview of Metabolism: Pathways, Enzymes, and Energy in Human Physiology

Study Guide - Practice Questions