Question 1

Which of the following statements best describes the main function of ATP in cellular metabolism?

Accepted Answer

ATP serves as the energy currency, providing energy for cellular reactions by transferring phosphate groups.

Question 2

Which of the following electron carriers is primarily involved in anabolic reactions such as photosynthesis?

Accepted Answer

NADP+

Question 3

A patient is prescribed a drug that acts as a noncompetitive inhibitor of a bacterial enzyme. Which of the following best describes how this drug works?

Accepted Answer

It binds to an allosteric site, changing the enzyme's shape and reducing activity.

Question 4

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

Accepted Answer

Changes in pH and temperature can disrupt hydrogen and ionic bonds, altering the enzyme's active site.

Question 5

During glycolysis, ATP is produced by which mechanism?

Accepted Answer

Substrate-level phosphorylation

Question 6

Which of the following is a correct summary of the products generated from one molecule of glucose after glycolysis, the Krebs cycle, and the electron transport chain in prokaryotes?

Accepted Answer

$$38$$ ATP, $$6 CO$_2$$, $$10$$ NADH, $$2$$ $$FADH_2$

Question 7

Which of the following best describes the role of the electron transport chain (ETC) in cellular respiration?

Accepted Answer

It transfers electrons through a series of carriers, creating a proton gradient used to generate ATP.

Question 8

In prokaryotic cells, where is the electron transport chain (ETC) located?

Accepted Answer

In the cytoplasmic (plasma) membrane

Question 9

Which of the following is NOT a product of fermentation?

Accepted Answer

Carbon dioxide and water

Question 10

A bacterium is growing in an environment lacking oxygen but containing nitrate (NO$$_3^-). $$Which process is most likely being used for energy production?

Accepted Answer

Anaerobic respiration

Question 11

Which of the following statements about catabolism and anabolism is correct?

Accepted Answer

Catabolism releases energy by breaking down molecules; anabolism uses energy to build molecules.

Question 12

Which of the following best describes the scientific contribution of Peter Mitchell?

Accepted Answer

He proposed the chemiosmotic theory explaining ATP synthesis via proton gradients.

Question 13

Which of the following is true regarding the regulation of metabolic pathways in bacteria?

Accepted Answer

Bacteria synthesize catabolic enzymes only when the substrate is available.

Question 14

Which of the following best explains why most organisms survive only within a relatively small pH range?

Accepted Answer

Enzyme structure and function are disrupted outside optimal pH, leading to loss of metabolic activity.

Question 15

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

It occurs in glycolysis and the Krebs cycle, producing ATP by direct transfer of a phosphate group to ADP.

Question 16

A microbe is found to produce lactic acid, ethanol, and acetate as metabolic end products. Which metabolic process is this microbe most likely using?

Accepted Answer

Fermentation

Question 17

Which of the following best describes the fate of pyruvate in fermentation?

Accepted Answer

It is reduced to various organic products to regenerate NAD$$^+.$$

Question 18

Which of the following is a true statement about the bonds linking amino acids in proteins?

Accepted Answer

They are peptide bonds, which are covalent.

Question 19

A scientist adds a molecule to a reaction that resembles the substrate and competes for the enzyme's active site. What type of inhibition is this?

Accepted Answer

Competitive inhibition

Question 20

Which of the following best explains why fermentation is less efficient than aerobic respiration in terms of ATP yield?

Accepted Answer

Fermentation does not use the electron transport chain, so less ATP is produced per glucose molecule.

Microbial Metabolism: Study Guide and Key Concepts

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