$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$$

Question 1

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

Accepted Answer

Catabolism breaks down complex molecules to release energy, while anabolism uses energy to build complex molecules from simpler ones.

Question 2

Which of the following statements about enzymes is CORRECT?

Accepted Answer

Enzymes lower the activation energy required for a reaction to occur.

Question 3

A competitive inhibitor of an enzyme acts by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 4

Which of the following is a coenzyme involved in redox reactions in cellular respiration?

Accepted Answer

NAD+

Question 5

What happens to an enzyme when it is exposed to temperatures above its optimal range?

Accepted Answer

It is denatured, losing its functional shape.

Question 6

Which of the following best describes the role of ATP in metabolism?

Accepted Answer

ATP stores energy released from catabolic reactions and provides energy for anabolic reactions.

Question 7

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

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 8

Which of the following is TRUE regarding feedback inhibition?

Accepted Answer

It is a form of noncompetitive inhibition where the end product binds to an allosteric site.

Question 9

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

Accepted Answer

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

Question 10

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation uses an organic molecule as the final electron acceptor.

Question 11

Which of the following is a product of glycolysis?

Accepted Answer

Pyruvic acid

Question 12

Which of the following best explains why sulfa drugs are effective antibiotics?

Accepted Answer

They inhibit bacterial folate synthesis by acting as competitive inhibitors of DHPS.

Question 13

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

Accepted Answer

Oxygen concentration

Question 14

Which of the following statements about oxidation-reduction (redox) reactions is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 15

Which of the following best describes the difference in ATP yield between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration yields more ATP per glucose molecule than anaerobic respiration.

Question 16

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

Accepted Answer

Glycolysis → Krebs cycle → Electron Transport Chain

Question 17

Which of the following is a likely consequence if a cell's enzymes become nonfunctional due to genetic mutation?

Accepted Answer

Metabolic pathways will be blocked, and essential products may not be synthesized.

Question 18

Which of the following is TRUE about the electron transport chain (ETC) in cellular respiration?

Accepted Answer

The ETC uses electrons from NADH and FADH2 to generate a proton gradient for ATP synthesis.

Question 19

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactic acid

Question 20

Which of the following best explains why E. coli produces more lactic acid when grown in glucose broth without O2 compared to with O2?

Accepted Answer

Without O2, E. coli uses fermentation, producing lactic acid as an end product.

Microbial Metabolism: An Overview of Energy Transformations in Microorganisms

Study Guide - Practice Questions