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

Question 1

Which of the following best describes the relationship between catabolic and anabolic reactions in cellular metabolism?

Accepted Answer

Catabolic reactions release energy by breaking down molecules, and anabolic reactions use that energy to build new molecules.

Question 2

Which equation correctly represents the ATP–ADP cycling process?

Accepted Answer

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

Question 3

Which of the following is NOT a characteristic of enzymes according to Table 8.1?

Accepted Answer

Enzymes are consumed during the reaction.

Question 4

A patient is diagnosed with anemia and mouth sores. Which vitamin coenzyme deficiency is most likely responsible, based on Table 8.3?

Accepted Answer

Vitamin B2 (Riboflavin)

Question 5

Which enzyme class is responsible for catalyzing the transfer of functional groups from one molecule to another?

Accepted Answer

Transferase

Question 6

What is the effect of increasing substrate concentration on enzyme activity, assuming enzyme concentration is constant?

Accepted Answer

The reaction rate increases until all active sites are saturated, then levels off.

Question 7

Which of the following best explains why enzymes lower the activation energy of a reaction?

Accepted Answer

Enzymes stabilize the transition state and properly orient reactants.

Question 8

Which of the following statements about competitive inhibition is correct?

Accepted Answer

Competitive inhibitors bind to the active site, preventing substrate binding.

Question 9

During aerobic cellular respiration, what is the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$\mathrm{O}_2)$$

Question 10

Which pathway is used by some Gram-negative bacteria to catabolize glucose and produces NADPH for anabolic reactions?

Accepted Answer

Entner-Doudoroff pathway

Question 11

Which of the following best describes the process of chemiosmosis in cellular respiration?

Accepted Answer

Protons flow through ATP synthase, generating ATP from ADP and inorganic phosphate.

Question 12

Which of the following is a major difference between fermentation and anaerobic respiration?

Accepted Answer

Fermentation does not use a respiratory chain, while anaerobic respiration does.

Question 13

Which of the following is a product of homolactic fermentation?

Accepted Answer

Lactic acid

Question 14

Which of the following statements about the Krebs cycle is correct?

Accepted Answer

The Krebs cycle produces ATP, NADH, FADH2, and releases CO2.

Question 15

Which of the following is NOT a method used by cells to phosphorylate ADP to ATP?

Accepted Answer

Hydrolysis phosphorylation

Question 16

Which of the following best describes an autotroph?

Accepted Answer

An organism that fixes carbon from inorganic sources to make organic molecules.

Question 17

Which of the following is a rapid analysis technique used to identify bacteria based on metabolic properties?

Accepted Answer

Analytical Profile Index (API) system

Question 18

Which of the following is a function of coenzymes in metabolic reactions?

Accepted Answer

Act as electron carriers between reactions

Question 19

Which of the following best describes the effect of extreme pH on enzyme activity?

Accepted Answer

Extreme pH can denature enzymes, reducing or eliminating their activity.

Microbial Metabolism: Principles and Applications

Study Guide - Practice Questions