Q: Which equation correctly represents the net ATP yield from glycolysis of one glucose molecule in bacteria?

$$C_6H_{12}O_6$ \rightarrow 2 \text{pyruvate} + 2 \text{ATP} + 2 \text{NADH}$$

Question 1

Which of the following best describes the role of the human gut microbiome in health?

Accepted Answer

It performs metabolic activities, protects against pathogens, and communicates with the brain and immune system.

Question 2

During aerobic respiration in bacteria, how is the proton motive force ($$PMF) $$generated?

Accepted Answer

By the movement of electrons through the electron transport system, which pumps $$H^+$$ ions across the membrane.

Question 3

Which process yields the highest amount of ATP per molecule of glucose in prokaryotes?

Accepted Answer

Aerobic respiration

Question 4

What is the main advantage of fermentation over respiration for facultative anaerobes?

Accepted Answer

Fermentation allows energy production in the absence of oxygen.

Question 5

Which of the following is TRUE about substrate-level phosphorylation?

Accepted Answer

It involves the direct transfer of a phosphate group from a high-energy intermediate to ADP.

Question 6

A patient with auto-brewery syndrome (ABS) can become intoxicated after eating high-sugar foods. Which microbial process is most likely responsible?

Accepted Answer

Fermentation of sugars to ethanol by gut microbes

Question 7

Which equation correctly represents the net ATP yield from glycolysis of one glucose molecule in bacteria?

Accepted Answer

$$C_6H_{12}O_6$ ightarrow 2 	ext{pyruvate} + 2 	ext{ATP} + 2 	ext{NADH}$$

Question 8

Which of the following statements about chemolithoautotrophs is correct?

Accepted Answer

They oxidize inorganic compounds for energy and fix $$CO_2 as $$their carbon source.

Question 9

In the electron transport system (ETS), what is the role of the terminal electron acceptor?

Accepted Answer

It receives electrons at the end of the ETS, allowing the chain to continue functioning.

Question 10

Which of the following is a real-world application of microbial metabolism?

Accepted Answer

Bioremediation, where microbes are used to eliminate toxic materials such as oil spills.

Question 11

Which pathway operates simultaneously with glycolysis and is essential for the production of pentoses needed for nucleic acids?

Accepted Answer

Pentose phosphate pathway

Question 12

A bacterium is classified as a chemoorganoheterotroph. What does this mean?

Accepted Answer

It uses organic compounds for both energy and carbon.

Question 13

Which of the following is a consequence of gut microbes converting dietary choline into trimethylamine (TMA)?

Accepted Answer

Increased risk of atherosclerosis due to metabolic byproducts.

Question 14

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

Accepted Answer

Oxidative phosphorylation via the electron transport system

Question 15

If a facultative anaerobe needs to produce 380 ATP molecules, how many glucose molecules must it metabolize by fermentation? (Assume 2 ATP per glucose)

Accepted Answer

$$190$$

Question 16

Which of the following is NOT a function of coenzymes such as NAD and FAD in metabolism?

Accepted Answer

Directly synthesizing ATP from ADP.

Question 17

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD by transferring electrons to pyruvate or its derivatives.

Question 18

Which microbial process is responsible for the production of short chain fatty acids in the human gut?

Accepted Answer

Fermentation of complex carbohydrates by gut microbes.

Question 19

Which of the following best explains why some people require higher doses of L-dopa to treat Parkinson's disease?

Accepted Answer

Gut bacteria convert L-dopa into dopamine in the intestine, preventing it from reaching the brain.

Question 20

Which of the following is TRUE about phototrophs?

Accepted Answer

They use light energy to drive ATP synthesis via an electron transport system.

Microbial Metabolism and the Human Microbiome: Mechanisms, Health Impacts, and Energy Generation

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