Question 1

Which of the following best describes the role of oxygen in aerobic cellular respiration?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, forming water.

Question 2

A bacterial cell is exposed to a metabolic poison that closely resembles glucose but cannot be metabolized. Which process will be most directly inhibited?

Accepted Answer

Glycolysis

Question 3

During aerobic respiration, what happens to the carbon atoms from glucose?

Accepted Answer

They are released as carbon dioxide ($$CO_2).$$

Question 4

Which of the following statements about ATP production in aerobic respiration is correct?

Accepted Answer

Most ATP is produced by oxidative phosphorylation via the electron transport chain.

Question 5

Which molecule is oxidized during glycolysis?

Accepted Answer

Glucose

Question 6

A patient is given a drug that inhibits the electron transport chain in mitochondria. What is a likely physiological effect?

Accepted Answer

Decreased ATP production and increased heat loss, potentially leading to weight loss.

Question 7

Which of the following best defines fermentation?

Accepted Answer

The oxidation of glucose with organic molecules serving as electron acceptors.

Question 8

Which of the following is a product of the Krebs cycle that transfers energy to the electron transport chain?

Accepted Answer

NADH and FADH$$_2$$

Question 9

Which metabolic pathway is common to nearly all aerobic and anaerobic organisms?

Accepted Answer

Glycolysis

Question 10

A strictly fermentative bacterium produces energy by which process?

Accepted Answer

Glycolysis only

Question 11

Which of the following statements about enzyme inhibition is correct?

Accepted Answer

Competitive inhibitors bind to the active site, while noncompetitive inhibitors bind to a different (allosteric) site.

Question 12

Which of the following is NOT true about beta-oxidation?

Accepted Answer

It is a step in glycolysis.

Question 13

During which stages of cellular respiration does substrate-level phosphorylation occur?

Accepted Answer

Glycolysis and the Krebs cycle

Question 14

Which of the following best describes the coupling of reactions in cellular metabolism?

Accepted Answer

An exergonic reaction is coupled with an endergonic reaction to perform cellular work.

Question 15

Which of the following is a correct statement about redox reactions?

Accepted Answer

Electrons are lost from one substance and added to another.

Question 16

A cell is exposed to high levels of tryptophan, resulting in decreased production of enzymes for tryptophan synthesis. This is an example of:

Accepted Answer

Feedback inhibition

Question 17

Which of the following is true regarding the energy yield from the complete oxidation of one molecule of glucose in bacteria?

Accepted Answer

Approximately 38 ATP are produced.

Question 18

Which of the following statements about NADH is correct?

Accepted Answer

NADH contains more potential energy than NAD$$^+.$$

Question 19

Which of the following best explains why ATP is an effective energy carrier in metabolism?

Accepted Answer

ATP stores energy in phosphate bonds that can be easily hydrolyzed and quickly regenerated from ADP.

Question 20

A cell is placed in an environment with a pH of 3. What is the most likely effect on its enzymes?

Accepted Answer

The enzyme's active site will be disrupted, reducing its activity.

Metabolism

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