Question 1

Which of the following best describes the difference between catabolic and anabolic pathways in microbial metabolism?

Accepted Answer

Catabolic pathways break larger molecules into smaller products and release energy, while anabolic pathways synthesize large molecules from smaller products and require energy.

Question 2

Which of the following is an example of substrate-level phosphorylation?

Accepted Answer

The generation of ATP from ADP and inorganic phosphate during glycolysis.

Question 3

In the context of redox reactions, what does the mnemonic 'OIL RIG' stand for?

Accepted Answer

'Oxidation Is Loss, Reduction Is Gain' of electrons.

Question 4

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction to proceed.

Question 5

Which of the following is NOT a way that cells phosphorylate ADP to ATP?

Accepted Answer

Hydrolytic phosphorylation

Question 6

Which of the following best explains why enzymes are sensitive to changes in temperature and pH?

Accepted Answer

Changes in temperature and pH can denature the enzyme, altering its three-dimensional conformation and active site.

Question 7

Which of the following is a correct summary of the net products of glycolysis per molecule of glucose?

Accepted Answer

2 ATP, 2 NADH, and 2 pyruvic acid

Question 8

During 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 feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway acts as an allosteric inhibitor of an enzyme early in the pathway.

Question 10

Which of the following is a key difference between aerobic respiration and fermentation?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, while fermentation uses an organic molecule.

Question 11

Which of the following is NOT a product of the Krebs cycle per molecule of glucose?

Accepted Answer

2 G3P

Question 12

Which process is responsible for the majority of ATP production during aerobic respiration?

Accepted Answer

Electron transport chain and chemiosmosis

Question 13

Which of the following statements about the Calvin-Benson cycle is correct?

Accepted Answer

It is an anabolic pathway that fixes carbon dioxide into organic molecules.

Question 14

Which of the following best describes the role of NAD+ in cellular metabolism?

Accepted Answer

NAD+ acts as an electron carrier, accepting electrons during redox reactions to become NADH.

Question 15

A bacterium is growing in an environment lacking oxygen but containing nitrate ($$NO_3$$^-$$). Which metabolic process is it most likely using to generate ATP?

Accepted Answer

Anaerobic respiration

Question 16

Which of the following is true about amphibolic pathways?

Accepted Answer

They can function in both anabolic and catabolic reactions.

Question 17

Which of the following best explains why increasing substrate concentration increases enzyme activity only up to a certain point?

Accepted Answer

All enzyme active sites become saturated with substrate, so the reaction rate plateaus.

Question 18

Which of the following is a correct description of competitive inhibition?

Accepted Answer

An inhibitor binds to the active site, preventing substrate binding.

Question 19

Which of the following is a direct product of the light-dependent reactions of photosynthesis?

Accepted Answer

ATP

Question 20

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP provides energy for anabolic reactions by transferring a phosphate group.

Microbial Metabolism: An Overview of Biochemical Pathways in Microbiology

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