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

Question 1

Which of the following best describes the role of enzymes in metabolic pathways?

Accepted Answer

Enzymes lower the activation energy required for reactions, allowing them to occur more efficiently.

Question 2

Which equation correctly represents the oxidation of glucose during aerobic respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}$$

Question 3

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Competing with the substrate for the active site of the enzyme.

Question 4

Which metabolic pathway is primarily responsible for the production of NADH, FADH2, and ATP from acetyl CoA?

Accepted Answer

Krebs Cycle (Citric Acid Cycle)

Question 5

During oxidative phosphorylation, what is the main function of the electron transport chain (ETC)?

Accepted Answer

To pump protons across a membrane, creating a gradient used to produce ATP.

Question 6

Which of the following statements about feedback inhibition is correct?

Accepted Answer

It is reversible and involves the end product binding to an allosteric site.

Question 7

Which of the following is NOT a product of glycolysis?

Accepted Answer

FADH2

Question 8

A facultative anaerobe is best described as an organism that:

Accepted Answer

Can grow with or without oxygen, using fermentation or respiration.

Question 9

Which of the following best explains the difference between catabolism and anabolism?

Accepted Answer

Catabolism breaks down complex molecules to release energy; anabolism uses energy to build complex molecules.

Question 10

Which of the following is a correct statement about phototrophs?

Accepted Answer

They use light as their energy source.

Question 11

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

Accepted Answer

Osmotic pressure

Question 12

Which of the following is a function of ribozymes?

Accepted Answer

Function as biological catalysts for RNA splicing and protein synthesis.

Question 13

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

Accepted Answer

It uses ATP and NADPH to reduce CO2 to sugar.

Question 14

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

Accepted Answer

$$NO_3$$^- \rightarrow $$NO_2^- + H_2O$

Question 15

Which of the following best describes the function of transferase enzymes?

Accepted Answer

Transfer functional groups between molecules.

Question 16

A microorganism that grows best at temperatures between 50°C and 60°C is classified as a:

Accepted Answer

Thermophile

Question 17

Which of the following is a correct statement about facultative halophiles?

Accepted Answer

They tolerate high salt concentrations (2–10% NaCl) but do not require them.

Question 18

Which of the following is a correct description of the role of agar in culture media?

Accepted Answer

It is a solidifying agent that is not metabolized or degraded by microbes.

Question 19

Which of the following is a correct statement about the use of thioglycolate in anaerobic growth media?

Accepted Answer

It combines with O2 to reduce its concentration, allowing anaerobic bacteria to grow.

Question 20

Which of the following is a correct example of a chemoheterotroph?

Accepted Answer

Fungi

Microbial Metabolism, Growth, and Laboratory Techniques: Study Notes

Study Guide - Practice Questions