$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \text{Phosphate} + \text{Energy}$$

Question 1

Which of the following best describes the process of catabolism in microbial metabolism?

Accepted Answer

The breakdown of nutrients to obtain energy and raw materials.

Question 2

In a redox reaction, which statement is correct regarding the electron donor and acceptor?

Accepted Answer

The electron donor is oxidized and the electron acceptor is reduced.

Question 3

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

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + 	ext{Phosphate} + 	ext{Energy}$$

Question 4

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

Accepted Answer

2 ATP and 2 NADH

Question 5

Which of the following is NOT a product of the Krebs cycle per two molecules of acetyl-CoA?

Accepted Answer

4 CO2

Question 6

What is the main function of the electron transport chain in cellular respiration?

Accepted Answer

To transfer electrons and create a proton gradient for ATP synthesis

Question 7

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation uses an organic molecule as the final electron acceptor.

Question 8

Which coenzyme is reduced to form NADH during glycolysis?

Accepted Answer

NAD+

Question 9

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

Accepted Answer

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

Question 10

Which enzyme class is responsible for catalyzing the transfer of functional groups between two substrates?

Accepted Answer

Transferase

Question 11

A bacterium is found to use the Entner-Doudoroff pathway. Which of the following is most likely TRUE about this organism?

Accepted Answer

It does not use glycolysis.

Question 12

Which of the following best explains why reduced forms of carbon (such as fats and carbohydrates) are energy-rich?

Accepted Answer

They have more electrons available for transfer in redox reactions.

Question 13

Which of the following is a correct summary equation for aerobic respiration of glucose?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 \rightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 38\ \mathrm{ATP}$$

Question 14

Which of the following statements about chemiosmosis is correct?

Accepted Answer

It uses the flow of protons down their electrochemical gradient to synthesize ATP.

Question 15

A patient with a genetic defect in the enzyme ATP synthase would most likely have problems with which process?

Accepted Answer

Chemiosmotic ATP production

Question 16

Which of the following is a feature of fermentation pathways?

Accepted Answer

They use an organic molecule as the final electron acceptor.

Question 17

Which of the following is a correct description of the fate of fatty acids during lipid catabolism in microbes?

Accepted Answer

Fatty acids are converted to acetyl-CoA and enter the Krebs cycle.

Question 18

Which of the following best explains why NAD+ is essential for glycolysis to continue?

Accepted Answer

NAD+ accepts electrons during glycolysis, allowing ATP production to continue.

Question 19

A bacterium is found to produce both lactic acid and ethanol as fermentation end-products. Which pathway is most likely active in this organism?

Accepted Answer

Mixed acid fermentation

Question 20

Which of the following is a correct statement about the role of coenzymes such as NAD+ and FAD in metabolism?

Accepted Answer

They shuttle electrons between different steps of metabolic pathways.

Microbial Metabolism: Pathways, Enzymes, and Energy Production

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