$$\mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{Pi} + \text{Energy}$$

Question 1

Which of the following best describes the difference between catabolism and anabolism in microbial metabolism?

Accepted Answer

Catabolism is the breakdown of substrates to release energy, while anabolism is the synthesis of macromolecules requiring energy.

Question 2

Which of the following equations correctly represents the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} ightarrow \mathrm{ADP} + \mathrm{Pi} + 	ext{Energy}$$

Question 3

Which of the following is NOT a function of enzymes in microbial metabolism?

Accepted Answer

Being permanently altered during the reaction

Question 4

Apoenzymes require which of the following to become functional holoenzymes?

Accepted Answer

A cofactor or coenzyme

Question 5

Which of the following statements about redox reactions in microbial metabolism is correct?

Accepted Answer

As a substrate is oxidized, a cellular carrier molecule is reduced.

Question 6

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

Accepted Answer

2 pyruvic acid, 2 ATP (net), 2 NADH + 2 H$$^+$$

Question 7

Which pathway is unique to bacteria and results in a net gain of one ATP, two NADPH, and precursor metabolites?

Accepted Answer

Entner-Doudoroff pathway

Question 8

During fermentation, what is the primary purpose of converting pyruvic acid into organic waste products?

Accepted Answer

To regenerate NAD$$^+$$ for glycolysis

Question 9

Which of the following is the correct equation for aerobic respiration of glucose?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 \rightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O}$$

Question 10

Which of the following is NOT a product of the Krebs cycle for each turn (one pyruvic acid entering)?

Accepted Answer

2 ATP

Question 11

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

Accepted Answer

To drive the phosphorylation of ADP to ATP via ATP synthase

Question 12

Which of the following statements about feedback inhibition is correct?

Accepted Answer

It involves the end product of a pathway inhibiting an enzyme early in the pathway.

Question 13

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 14

Which of the following is a common misconception about enzyme activity?

Accepted Answer

Enzymes are consumed during the reaction.

Question 15

Which of the following is true regarding the location of the Krebs cycle in prokaryotes and eukaryotes?

Accepted Answer

It occurs in the cytoplasm of prokaryotes and the mitochondrial matrix of eukaryotes.

Question 16

Which of the following is NOT a type of enzyme inhibitor?

Accepted Answer

Substrate inhibitor

Question 17

Which of the following best explains why fermentation is less efficient than respiration?

Accepted Answer

Fermentation does not use the electron transport chain and produces less ATP.

Question 18

Which of the following is an example of an amphibolic pathway?

Accepted Answer

A pathway that can function in both catabolism and anabolism

Question 19

Which of the following is a role of NAD$$^+ in $$microbial metabolism?

Accepted Answer

It serves as an electron carrier, being reduced to NADH.

Question 20

Which of the following is a correct statement about the integration of cellular metabolism?

Accepted Answer

Precursor metabolites from glycolysis and the Krebs cycle are used in biosynthesis of macromolecules.

Microbial Metabolism: Foundations and Pathways

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