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 component of an enzyme system?

Accepted Answer

Ribosome

Question 3

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

Accepted Answer

It binds to the active site, preventing the substrate from binding.

Question 4

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

Accepted Answer

Osmotic pressure

Question 5

During aerobic respiration in prokaryotes, how many molecules of ATP are 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 (via oxidative phosphorylation)

Question 7

Which of the following best describes feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway inhibits an enzyme that acts early in the pathway.

Question 8

Which of the following is the correct sequence for the complete catabolism of glucose to carbon dioxide?

Accepted Answer

Glycolysis $$\rightarrow$$ Oxidative decarboxylation of pyruvate $$\rightarrow$$ Kreb’s cycle $$\rightarrow$$ Electron transport chain

Question 9

Which of the following statements about oxidation-reduction (redox) reactions is TRUE?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 10

A strictly fermentative bacterium produces energy by:

Accepted Answer

Using substrate-level phosphorylation during glycolysis.

Question 11

Which of the following is a correct example of a final electron acceptor in anaerobic respiration?

Accepted Answer

$$NO_3$$^-$$

Question 12

Why do some eukaryotic cells produce only 36 ATP from the complete oxidation of one glucose molecule, compared to 38 ATP in prokaryotes?

Accepted Answer

Some ATP is used to transport NADH from the cytoplasm into the mitochondria.

Question 13

Which of the following best describes beta oxidation?

Accepted Answer

The process of breaking down fatty acids into acetyl-CoA units.

Question 14

In which part of a eukaryotic cell does the Kreb’s citric acid cycle occur?

Accepted Answer

Mitochondrial matrix

Question 15

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

Accepted Answer

Production of lactic acid in muscles during intense exercise

Question 16

Which of the following best describes chemiosmosis?

Accepted Answer

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

Question 17

Which of the following is NOT a way that ATP can be produced in a cell?

Accepted Answer

Hydrolysis of DNA

Question 18

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

Accepted Answer

Cyclic photophosphorylation involves electrons returning to the original chlorophyll, while non-cyclic involves electrons being transferred to NADP$$^+.$$

Question 19

Which of the following nutritional types of microorganisms uses light as an energy source and carbon dioxide 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 an example of, and what is the likely effect on the pathway if the end product accumulates?

Accepted Answer

Feedback inhibition; the pathway will slow down or stop.

Microbial Metabolism Study Guide – Step-by-Step Guidance

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