Question 1

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

Accepted Answer

Catabolism breaks down molecules to release energy, which is then used by anabolism to build complex molecules.

Question 2

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in its high-energy phosphate bonds, which is released when a phosphate group is removed.

Question 3

During glycolysis, what is the net gain of ATP and NADH molecules from one molecule of glucose?

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 4

Which of the following is NOT a function of enzymes in metabolism?

Accepted Answer

Being consumed and permanently altered during reactions

Question 5

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is generated by the direct transfer of a phosphate group to ADP from another phosphorylated compound.

Question 6

Which molecule serves as the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 7

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and preventing substrate binding

Question 8

Which of the following is a key function of the electron transport chain (ETC) in cellular respiration?

Accepted Answer

Pumping protons across a membrane to create a proton gradient

Question 9

Which of the following best explains why fermentation is necessary in some cells?

Accepted Answer

Fermentation regenerates NAD+ so glycolysis can continue in the absence of an electron transport chain.

Question 10

Which of the following is NOT a product of the Krebs cycle per molecule of glucose?

Accepted Answer

$$6$$ $$CO_2$

Question 11

Which of the following statements about the Calvin-Benson cycle is correct?

Accepted Answer

It fixes carbon dioxide into organic molecules using ATP and NADPH.

Question 12

Which of the following is an example of an amphibolic pathway?

Accepted Answer

The Krebs cycle, because it can function in both catabolic and anabolic processes.

Question 13

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

Accepted Answer

Glycolysis → Synthesis of acetyl-CoA → Krebs cycle → Electron transport chain

Question 14

Which of the following is a role of NAD+ in cellular metabolism?

Accepted Answer

It serves as an electron carrier, accepting electrons during redox reactions.

Question 15

Which of the following best describes the effect of temperature on enzyme activity?

Accepted Answer

Enzyme activity increases with temperature up to an optimum, then decreases due to denaturation.

Question 16

Which of the following is true regarding the regulation of metabolic pathways in cells?

Accepted Answer

Cells regulate metabolism by controlling gene expression and enzyme activity.

Question 17

Which of the following is a correct statement about the role of electron carriers in metabolism?

Accepted Answer

Electron carriers such as NAD+, NADP+, and FAD transport electrons between metabolic reactions.

Question 18

Which of the following is a distinguishing feature of photophosphorylation?

Accepted Answer

It uses light energy to generate ATP from ADP and inorganic phosphate.

Question 19

A cell is exposed to a noncompetitive inhibitor. What is the most likely effect on enzyme activity?

Accepted Answer

The inhibitor binds to an allosteric site, changing the enzyme's shape and reducing activity.

Question 20

Which of the following is a product of lipid catabolism that can enter the Krebs cycle?

Accepted Answer

Acetyl-CoA

Microbial Metabolism: Chemical Reactions and Pathways

Study Guide - Practice Questions