Question 1

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

Accepted Answer

Catabolism breaks down molecules to release energy (exergonic), while anabolism uses energy to build macromolecules (endergonic).

Question 2

During glycolysis, glucose is split into two molecules of pyruvate. Which type of phosphorylation is responsible for the direct production of ATP in this pathway?

Accepted Answer

Substrate-level phosphorylation

Question 3

Which molecule acts as the 'energy currency' of the cell, storing energy in its phosphate bonds?

Accepted Answer

ATP

Question 4

A drug that resembles the substrate of an enzyme and binds to its active site, preventing the substrate from binding, is best described as a:

Accepted Answer

Competitive inhibitor

Question 5

Which of the following is NOT a factor that can affect enzyme activity?

Accepted Answer

Substrate's molecular weight

Question 6

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

Accepted Answer

O$$_2$$

Question 7

Which of the following best explains why most organisms survive only within a relatively small pH range?

Accepted Answer

Enzymes are denatured at extreme pH, losing their function.

Question 8

Which process is responsible for the majority of ATP production during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 9

Where is the electron transport chain (ETC) located in prokaryotic cells?

Accepted Answer

Cytoplasmic membrane

Question 10

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation regenerates NAD$$^+ so $$glycolysis can continue.

Question 11

Which of the following is a product of the Krebs cycle?

Accepted Answer

CO$$_2$$

Question 12

Which electron carrier is reduced during glycolysis and carries electrons to the electron transport chain?

Accepted Answer

NADH

Question 13

A scientist is studying a bacterium that produces ethanol and CO$$_2 as $$waste products. Which metabolic pathway is most likely being used?

Accepted Answer

Fermentation

Question 14

Which of the following best describes the role of ATP synthase in cellular respiration?

Accepted Answer

It uses the proton gradient to phosphorylate ADP to ATP.

Question 15

Which of the following is a plausible reason why a drug that acts as a noncompetitive inhibitor would decrease enzyme activity?

Accepted Answer

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

Question 16

Which of the following is a commercial product produced by microbial fermentation?

Accepted Answer

Ethanol

Question 17

Which scientist is credited with the discovery of chemiosmosis and the mechanism of ATP synthesis in mitochondria?

Accepted Answer

Peter Mitchell

Question 18

Which of the following equations correctly represents the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{P}$$

Question 19

A cell is exposed to a sudden increase in temperature. Which of the following is most likely to occur to its enzymes?

Accepted Answer

Enzymes will denature, losing their three-dimensional structure and function.

Question 20

Which of the following statements about the electron transport chain (ETC) is TRUE?

Accepted Answer

The ETC uses a series of redox reactions to create a proton gradient.

Microbial Metabolism: Study Notes for Chapter 5

Study Guide - Practice Questions

Study Guide - Flashcards