Question 1

Which statement best describes the relationship between catabolism and anabolism in cellular metabolism?

Accepted Answer

Catabolism breaks down nutrients to produce ATP, which is then used by anabolism to build larger molecules.

Question 2

During glycolysis, which of the following is the net production per molecule of glucose?

Accepted Answer

$$2$$ ATP, $$2$$ NADH, $$2$$ pyruvate

Question 3

Which of the following best explains the role of NAD+ and FAD in cellular respiration?

Accepted Answer

They transfer electrons from food to ATP by transporting electrons to the electron transport chain.

Question 4

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 5

Which of the following is a product of fermentation in bacteria?

Accepted Answer

Acetic acid

Question 6

What is the main difference between cellular respiration and fermentation?

Accepted Answer

Cellular respiration uses oxygen, while fermentation does not.

Question 7

Which molecule is the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 8

Which pathway produces both NADPH and ATP, and starts with glucose?

Accepted Answer

Pentose phosphate pathway

Question 9

What is the function of enzymes in metabolic reactions?

Accepted Answer

They speed up reactions and reduce energy requirements.

Question 10

Which of the following best describes feedback inhibition?

Accepted Answer

The end product of a pathway inhibits an enzyme involved earlier in the pathway.

Question 11

Which of the following is NOT a product of the Krebs cycle?

Accepted Answer

NADPH

Question 12

If a cell is exposed to extremely high temperatures, what is the most likely effect on its enzymes?

Accepted Answer

Enzymes become denatured and lose their function.

Question 13

Which of the following is true about noncompetitive enzyme inhibitors?

Accepted Answer

They bind to a site other than the active site and alter enzyme activity.

Question 14

Which process produces the most ATP per glucose molecule?

Accepted Answer

Aerobic cellular respiration

Question 15

What is the role of acetyl-CoA in cellular respiration?

Accepted Answer

It enters the Krebs cycle to produce NADH, FADH$$_2$$, and CO$$_2.$$

Question 16

Which of the following is a real-world example of a product formed by microbial fermentation?

Accepted Answer

Beer

Question 17

Which of the following best describes the process of substrate-level phosphorylation?

Accepted Answer

ATP is produced directly from the transfer of a phosphate group to ADP from a substrate.

Question 18

Which of the following is a key difference between the pentose phosphate pathway and glycolysis?

Accepted Answer

Pentose phosphate pathway produces NADPH, while glycolysis produces NADH.

Question 19

Which of the following organisms is capable of anaerobic respiration?

Accepted Answer

Bacteria

Microbial Metabolism and Enzyme Function: Study Notes for Microbiology

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