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 scientist is studying a metabolic pathway in which the end product inhibits the activity of the first enzyme in the pathway. This is an example of:

Accepted Answer

Feedback inhibition

Question 4

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

Accepted Answer

Genetic code of the organism

Question 5

During glycolysis, what is the net gain of ATP molecules produced per molecule of glucose via substrate-level phosphorylation?

Accepted Answer

$$2$$

Question 6

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

Accepted Answer

Electron transport chain and chemiosmosis

Question 7

Which of the following best describes the role of the active site of an enzyme?

Accepted Answer

It is the region where the substrate binds and the reaction occurs.

Question 8

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 9

Which of the following is the correct sequence for the complete aerobic catabolism of glucose?

Accepted Answer

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

Question 10

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

Accepted Answer

Oxygen ($$O_2)$$

Question 11

Which of the following best explains why only 36 ATP are produced from one molecule of glucose in some eukaryotic cells, compared to 38 ATP in prokaryotic cells?

Accepted Answer

Eukaryotic cells lose 2 ATP transporting NADH from the cytoplasm into the mitochondria.

Question 12

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

Accepted Answer

$$NAD^+ + 2H \rightarrow NADH + H^+$$

Question 13

Beta oxidation is a process used by cells to:

Accepted Answer

Break down fatty acids into acetyl-CoA units.

Question 14

A strictly fermentative bacterium produces energy by:

Accepted Answer

Using glycolysis followed by fermentation to regenerate $$NAD^+.$$

Question 15

Which of the following best describes chemiosmosis?

Accepted Answer

The generation of ATP using a proton gradient across a membrane.

Question 16

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

Accepted Answer

Photoautotroph

Question 17

Which process is responsible for the bubbles observed in an orange juice drink left overnight?

Accepted Answer

Fermentation producing $$CO_2$$

Question 18

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It involves the direct transfer of a phosphate group to ADP from a phosphorylated intermediate.

Question 19

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 uses both photosystem I and II and produces both ATP and NADPH.

Question 20

Which of the following is a correct description of the Calvin-Benson cycle?

Accepted Answer

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

Microbial Metabolism Study Guide – Step-by-Step Guidance

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