Question 1

Which of the following best describes catabolic reactions in microbial metabolism?

Accepted Answer

They break down complex organic molecules into simpler ones using hydrolytic reactions.

Question 2

What is the primary role of enzymes in metabolic pathways?

Accepted Answer

To lower the activation energy, allowing reactions to occur faster.

Question 3

Which statement about enzyme specificity is correct?

Accepted Answer

Enzymes typically function in a 1-to-1, lock and key mechanism with their substrate.

Question 4

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Competing with the substrate for the active site, preventing substrate binding.

Question 5

Which of the following is an example of feedback inhibition in a metabolic pathway?

Accepted Answer

The final product of the pathway binds allosterically to an enzyme, shutting down the pathway.

Question 6

During glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

$$2$$

Question 7

Which process is responsible for the conversion of glucose to pyruvic acid?

Accepted Answer

Glycolysis

Question 8

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

Accepted Answer

Oxygen ($$O_2)$$

Question 9

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

The addition of an inorganic phosphate group to ADP directly from a substrate.

Question 10

Which metabolic process can occur in the absence of oxygen and does not require the Krebs cycle or electron transport chain?

Accepted Answer

Fermentation

Question 11

Which of the following is a correct description of an anabolic reaction?

Accepted Answer

It builds complex molecules from simpler ones using dehydration synthesis.

Question 12

Which component of an enzyme is responsible for binding the substrate?

Accepted Answer

Active site

Question 13

Which of the following environmental factors can deactivate enzymes?

Accepted Answer

High temperature, low substrate concentration, and inhibiting compounds

Question 14

Which process is responsible for the removal of an amino group from proteins during metabolism?

Accepted Answer

Deamination

Question 15

Which of the following is true about microbial metabolic diversity?

Accepted Answer

Microbes can gain energy from light or organic molecules and may produce their own food.

Question 16

Which of the following equations correctly represents the net output of glycolysis per molecule of glucose?

Accepted Answer

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

Question 17

Which metabolic pathway is most productive in terms of ATP yield per glucose molecule?

Accepted Answer

Aerobic respiration (including electron transport chain)

Question 18

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

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

Question 19

In noncompetitive enzyme inhibition, the inhibitor:

Accepted Answer

Binds to the enzyme body, changing the shape of the active site so the substrate cannot bind.

Question 20

Which of the following is NOT a function of metabolism in living cells?

Accepted Answer

Direct absorption of ATP from the environment

Microbial Metabolism: An Overview of Metabolic Pathways in Microorganisms

Study Guide - Practice Questions