Question 1

Which of the following best describes the difference between catabolism and anabolism in cellular metabolism?

Accepted Answer

Catabolism breaks down organic substrates to release energy, while anabolism uses energy to synthesize new organic molecules.

Question 2

During glycolysis, one molecule of glucose ($$C_6H_{12}O_6$) is converted into which of the following products?

Accepted Answer

2 molecules of pyruvate, 2 molecules of ATP, and 2 molecules of NADH

Question 3

Which of the following is the primary function of the nutrient pool in cellular metabolism?

Accepted Answer

To provide a source of organic substrates for both catabolic and anabolic reactions

Question 4

In the citric acid cycle, what is the fate of the carbon atoms from acetyl-CoA?

Accepted Answer

They are released as $$CO_2$$

Question 5

Which coenzymes are responsible for carrying hydrogen atoms to the electron transport chain during cellular respiration?

Accepted Answer

NADH and FADH$$_2$$

Question 6

What is the main purpose of oxidative phosphorylation in the electron transport chain?

Accepted Answer

To generate a proton gradient used to make ATP

Question 7

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

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP$$

Question 8

During starvation, which tissue is prioritized for glucose supply, and what alternative substrates do other tissues use?

Accepted Answer

Nervous tissue is prioritized for glucose; other tissues use fatty acids and amino acids.

Question 9

Which step in cellular respiration produces the majority of ATP used by body cells?

Accepted Answer

Oxidative phosphorylation in the electron transport chain

Question 10

If a cell lacks oxygen, which process will be inhibited, and what is the likely consequence for ATP production?

Accepted Answer

Electron transport chain will be inhibited, and ATP production will decrease.

Question 11

Which of the following is a correct description of the role of NAD$$^+ in $$cellular metabolism?

Accepted Answer

NAD$$^+$$ accepts electrons during redox reactions and becomes NADH.

Question 12

Which of the following best explains why the electron transport chain is essential for aerobic metabolism?

Accepted Answer

It transfers electrons to oxygen, allowing for the production of a large amount of ATP.

Question 13

A patient with a mitochondrial disorder is unable to efficiently produce ATP. Which metabolic pathway is most likely affected?

Accepted Answer

Electron transport chain

Question 14

Which of the following is NOT a product of the citric acid cycle for each acetyl-CoA molecule entering the cycle?

Accepted Answer

2 molecules of pyruvate

Question 15

Which process is responsible for the conversion of ADP to ATP in the mitochondria, and what is the driving force behind it?

Accepted Answer

Oxidative phosphorylation driven by a proton gradient across the inner mitochondrial membrane

Question 16

Which of the following statements about glycolysis is correct?

Accepted Answer

Glycolysis produces 2 ATP molecules per glucose molecule.

Question 17

In the context of metabolism, what is meant by 'metabolic turnover'?

Accepted Answer

The continuous breakdown and replacement of organic materials within cells.

Question 18

Which of the following best describes the role of the nutrient pool during periods of fasting?

Accepted Answer

It is mobilized from reserves such as glycogen and triglycerides.

Question 19

Which of the following is a correct sequence of events in cellular respiration?

Accepted Answer

Glycolysis $$\rightarrow$$ Citric Acid Cycle $$\rightarrow$$ Electron Transport Chain

Metabolism, Nutrition, and Energetics: Cellular Metabolism and Energy Production

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