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

$$\text{Glucose} \rightarrow 2 \text{Pyruvate} + 2 \text{ATP} + 2 \text{NADH}$$

Question 1

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is synthesized directly from ADP and a high-energy phosphate group transferred from an organic intermediate.

Question 2

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

Accepted Answer

Oxygen ($$O_2)$$

Question 3

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

Accepted Answer

Aerobic respiration

Question 4

What is the main role of the proton motive force (PMF) in bacterial cells?

Accepted Answer

To drive the synthesis of ATP via ATP synthase

Question 5

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation regenerates NAD$$^+ by $$transferring electrons to an organic molecule.

Question 6

A facultative anaerobe is grown in the absence of oxygen. Which metabolic pathway will it most likely use to generate ATP?

Accepted Answer

Fermentation

Question 7

Which of the following is a function of gut microbes that directly impacts human health?

Accepted Answer

Production of short-chain fatty acids from complex carbohydrates

Question 8

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

Accepted Answer

$$	ext{Glucose} ightarrow 2 	ext{Pyruvate} + 2 	ext{ATP} + 2 	ext{NADH}$$

Question 9

Which of the following best explains why less ATP is produced during anaerobic respiration compared to aerobic respiration?

Accepted Answer

The final electron acceptor in anaerobic respiration has a lower reduction potential than oxygen.

Question 10

Which of the following is a real-world application of bioremediation?

Accepted Answer

Using bacteria to degrade oil spills in the ocean

Question 11

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

Accepted Answer

Fermentation of sugars to ethanol by gut microbes

Question 12

Which of the following best describes a chemoorganoheterotroph?

Accepted Answer

An organism that obtains both energy and carbon from organic compounds

Question 13

Which of the following is a direct consequence of the proton gradient generated by the electron transport chain?

Accepted Answer

Synthesis of ATP from ADP and $$P_i$$ via ATP synthase

Question 14

Which metabolic pathway is essential for the regeneration of NAD$$^+ in $$the absence of oxygen?

Accepted Answer

Fermentation

Question 15

A mutation in a gut bacterium prevents it from producing TMA lyase. What is the most likely effect on the host?

Accepted Answer

Reduced risk of atherosclerosis due to decreased TMAO production

Question 16

Which of the following best explains why some Parkinson’s patients require higher doses of L-dopa?

Accepted Answer

Gut bacteria convert L-dopa to dopamine before it can cross the blood-brain barrier.

Question 17

Which of the following is a key difference between phototrophy and chemolithotrophy?

Accepted Answer

Phototrophy uses light energy to excite electrons, while chemolithotrophy uses energy from inorganic chemical reactions.

Question 18

Which of the following is a plausible outcome of a fecal transplant from a lean donor to an obese recipient?

Accepted Answer

The recipient’s gut microbiome composition may shift, potentially leading to weight loss.

Question 19

Which of the following best describes the role of coenzymes such as NAD and FAD in metabolism?

Accepted Answer

They act as temporary carriers of electrons and hydrogen ions during metabolic reactions.

Question 20

How many molecules of glucose are required to generate 380 ATP via aerobic respiration in bacteria, assuming 38 ATP per glucose?

Accepted Answer

$$\frac{380}{38} = 10$$ molecules

Microbial Metabolism and Its Impact on Human Health

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