Q: Which of the following equations correctly represents substrate-level phosphorylation?

$$\mathrm{ADP} + \text{phosphorylated substrate} \rightarrow \mathrm{ATP} + \text{substrate}$$

Q: Which of the following is a correct equation for the decarboxylation of pyruvic acid during acetyl-CoA synthesis?

$$\mathrm{Pyruvic\ acid} + \mathrm{CoA} \rightarrow \mathrm{Acetyl\text{-}CoA} + \mathrm{CO_2$}$$

Q: Which of the following is a correct equation for ATP synthesis via chemiosmosis?

$$\mathrm{ADP} + \mathrm{P_i} \xrightarrow{\text{ATP\ synthase}} \mathrm{ATP}$$

Question 1

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

Accepted Answer

Catabolic pathways break down nutrients to release energy, which is then used by anabolic pathways to synthesize macromolecules.

Question 2

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

Accepted Answer

2 ATP and 2 NADH

Question 3

Which of the following equations correctly represents substrate-level phosphorylation?

Accepted Answer

$$\mathrm{ADP} + 	ext{phosphorylated substrate} ightarrow \mathrm{ATP} + 	ext{substrate}$$

Question 4

A bacterium is exposed to a competitive inhibitor. Which of the following best describes the effect on enzyme activity?

Accepted Answer

The inhibitor binds to the active site, blocking substrate binding without denaturing the enzyme.

Question 5

Which of the following is a correct description of oxidative phosphorylation?

Accepted Answer

ATP is synthesized using energy from redox reactions and inorganic phosphate during respiration.

Question 6

In the electron transport chain, what is the primary function of the proton gradient?

Accepted Answer

To provide potential energy for ATP synthesis via ATP synthase.

Question 7

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation regenerates NAD+ for glycolysis by using an organic molecule as the final electron acceptor.

Question 8

A cell is exposed to high temperatures, causing its enzymes to denature. What is the most likely outcome?

Accepted Answer

The cell's metabolic pathways will slow or stop due to loss of enzyme function.

Question 9

Which pathway produces precursor metabolites and NADPH required for biosynthesis of nucleotides, steroids, and fatty acids?

Accepted Answer

Pentose phosphate pathway

Question 10

Which of the following is a correct equation for the decarboxylation of pyruvic acid during acetyl-CoA synthesis?

Accepted Answer

$$\mathrm{Pyruvic\ acid} + \mathrm{CoA} ightarrow \mathrm{Acetyl	ext{-}CoA} + \mathrm{CO_2$}$$

Question 11

Which of the following best explains why feedback inhibition is important in metabolic pathways?

Accepted Answer

It prevents the overproduction of end products by inhibiting earlier steps in the pathway.

Question 12

A microorganism is found to use nitrate ($$\mathrm{NO_3$^-}) as $$its final electron acceptor in the electron transport chain. Which type of respiration is this?

Accepted Answer

Anaerobic respiration

Question 13

Which enzyme class is responsible for transferring functional groups between molecules?

Accepted Answer

Transferases

Question 14

Which of the following is a correct equation for ATP synthesis via chemiosmosis?

Accepted Answer

$$\mathrm{ADP} + \mathrm{P_i} \xrightarrow{	ext{ATP\ synthase}} \mathrm{ATP}$$

Question 15

Which of the following statements about amphibolic reactions is TRUE?

Accepted Answer

Amphibolic reactions can proceed toward catabolism or anabolism depending on cellular needs.

Question 16

A cell is synthesizing amino acids by transamination. Which coenzyme is required for this process?

Accepted Answer

Pyridoxal phosphate

Question 17

Which of the following is a real-life application of fermentation in industry?

Accepted Answer

Production of ethanol for alcoholic beverages

Question 18

Which of the following is NOT a function of the electron carrier molecules NAD+, NADP+, and FAD?

Accepted Answer

Directly catalyzing substrate-level phosphorylation

Question 19

Which of the following best describes the process of gluconeogenesis?

Accepted Answer

The synthesis of glucose from noncarbohydrate precursors

Microbial Metabolism: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards