Question 1

Which of the following best describes catabolism in microbial metabolism?

Accepted Answer

The breakdown of complex molecules into simpler ones, releasing energy.

Question 2

Which of the following is NOT a function of an enzyme in a metabolic pathway?

Accepted Answer

Being consumed and permanently altered during the reaction.

Question 3

A patient is given a drug that acts as a noncompetitive inhibitor of a bacterial enzyme. Which of the following best describes how this drug works?

Accepted Answer

It binds to an allosteric site, changing the enzyme's shape and reducing activity.

Question 4

Which of the following factors does NOT directly influence enzymatic activity?

Accepted Answer

Genetic code of the organism

Question 5

During aerobic respiration in prokaryotes, how many molecules of ATP are typically produced from the complete oxidation of one molecule of glucose?

Accepted Answer

$$38$$

Question 6

Which process produces the most ATP during the complete oxidation of glucose in aerobic respiration?

Accepted Answer

Electron transport chain and chemiosmosis

Question 7

A bacterium is found to use nitrate ($$NO_3$$^-$$) as its final electron acceptor in respiration. Which type of respiration is this?

Accepted Answer

Anaerobic respiration

Question 8

Which of the following best describes feedback inhibition in a metabolic pathway?

Accepted Answer

The end product of a pathway inhibits an enzyme earlier in the pathway.

Question 9

Which of the following is an example of an oxidation-reduction (redox) reaction?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O$$

Question 10

Which of the following statements about glycolysis is correct?

Accepted Answer

It produces a net gain of $$2$$ ATP molecules per glucose by substrate-level phosphorylation.

Question 11

Which of the following best explains why eukaryotic cells typically produce only $$36$$ ATP from one glucose, while prokaryotic cells produce $$38$$ ATP?

Accepted Answer

Eukaryotic cells lose $$2$$ ATP transporting NADH into mitochondria.

Question 12

Which of the following is a correct description of beta oxidation?

Accepted Answer

The breakdown of fatty acids into two-carbon units for entry into the Kreb’s cycle.

Question 13

A strictly fermentative bacterium produces energy by:

Accepted Answer

Using substrate-level phosphorylation only.

Question 14

Which of the following is true regarding the Calvin-Benson cycle?

Accepted Answer

It is an anabolic pathway that fixes $$CO_2$$ into organic molecules.

Question 15

Which of the following best differentiates cyclic from non-cyclic photophosphorylation?

Accepted Answer

Cyclic photophosphorylation involves only photosystem I and recycles electrons, while non-cyclic involves both photosystems and generates NADPH.

Question 16

Which of the following is a real-life example of fermentation?

Accepted Answer

The production of lactic acid in muscles during intense exercise.

Question 17

Which of the following best describes chemiosmosis in cellular respiration?

Accepted Answer

The movement of protons across a membrane to generate ATP via ATP synthase.

Question 18

Which of the following is NOT a component of an enzyme system?

Accepted Answer

Ribosome

Question 19

Which of the following nutritional types of microorganisms uses light as an energy source and $$CO_2 as a $$carbon source?

Accepted Answer

Photoautotroph

Question 20

A scientist is studying a metabolic pathway in which the end product inhibits the first enzyme in the pathway. Which type of regulation is this, and what is the advantage for the cell?

Accepted Answer

Feedback inhibition; it prevents the overaccumulation of the end product.

Microbial Metabolism Study Guide – Step-by-Step Guidance

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