Question 1

Which of the following best describes the primary goal of microbial metabolism?

Accepted Answer

To enable the reproduction of the organism

Question 2

Which statement correctly distinguishes between catabolic and anabolic pathways in microbial metabolism?

Accepted Answer

Catabolic pathways break down large molecules into smaller products, while anabolic pathways synthesize large molecules from smaller ones.

Question 3

Which of the following is the correct structure of ATP?

Accepted Answer

A molecule composed of a nitrogenous base, a five-carbon sugar, and three phosphate groups

Question 4

Which mnemonic helps remember the difference between oxidation and reduction in redox reactions?

Accepted Answer

OIL: Oxidation Involves Loss; RIG: Reduction Involves Gain

Question 5

How do enzymes speed up chemical reactions in microbial metabolism?

Accepted Answer

By lowering the activation energy required for the reaction

Question 6

Which of the following best describes a holoenzyme?

Accepted Answer

A functional enzyme consisting of an apoenzyme and its cofactor

Question 7

A scientist is studying an enzyme-catalyzed reaction. She adds a molecule that binds to the enzyme's active site, preventing substrate binding. What type of molecule did she add?

Accepted Answer

Competitive inhibitor

Question 8

Which of the following conditions is most likely to cause an enzyme to denature and lose its function?

Accepted Answer

Extreme changes in temperature or pH

Question 9

Which of the following is an example of feedback inhibition in microbial metabolism?

Accepted Answer

A product of a metabolic pathway binding to an allosteric site on an enzyme, shutting down the pathway

Question 10

During glycolysis, what is the net gain of ATP and NADH per molecule of glucose?

Accepted Answer

$2$ ATP and $2$ NADH

Question 11

Which of the following best describes the three broad stages of glycolysis?

Accepted Answer

Energy-investment stage, lysis stage, energy-conserving stage

Question 12

In the glycolytic pathway, which molecule is cleaved to form two three-carbon molecules?

Accepted Answer

Fructose 1,6-bisphosphate

Question 13

Which of the following is a correct summary of the products of the Krebs cycle (TCA cycle) for one molecule of glucose?

Accepted Answer

$2$ ATP, $6$ NADH, $2$ FADH_2$, and $4$ CO_2$

Question 14

Which of the following best explains why the TCA cycle is also called the citric acid cycle?

Accepted Answer

Because citric acid is the first product formed in the cycle

Question 15

A mutation in a bacterium prevents the formation of NADH during glycolysis. Which of the following would most likely be affected?

Accepted Answer

The transfer of electrons to the electron transport chain

Question 16

Which of the following best describes the role of coenzymes such as NAD+ and FAD in cellular respiration?

Accepted Answer

They transfer electrons from one molecule to another during redox reactions

Question 17

A patient is given a drug that acts as a noncompetitive inhibitor of a key metabolic enzyme. What is the most likely effect of this drug?

Accepted Answer

It will bind to an allosteric site, changing the enzyme's shape and reducing its activity

Question 18

Which of the following best explains why feedback inhibition is an effective method of metabolic regulation?

Accepted Answer

It prevents the overproduction of end-products by shutting down the pathway when enough product is present

Question 19

Which of the following equations correctly represents the net ATP yield from glycolysis per molecule of glucose?

Accepted Answer

$	ext{Glucose} + 2 	ext{NAD}^+ + 2 	ext{ADP} + 2 	ext{P}_i ightarrow 2 	ext{Pyruvate} + 2 	ext{NADH} + 2 	ext{ATP} + 2 	ext{H}_2	ext{O}$

Microbial Metabolism: Enzymes, Pathways, and Cellular Respiration

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