Question 1

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

Accepted Answer

Catabolism breaks down molecules to release energy, which is then used by anabolism to build macromolecules.

Question 2

Which of the following statements about enzymes is CORRECT?

Accepted Answer

Enzymes lower the activation energy ($$E_a) $$required for a reaction to proceed.

Question 3

A competitive inhibitor of an enzyme acts by:

Accepted Answer

Binding to the active site, preventing substrate binding.

Question 4

Which of the following is a product of glycolysis?

Accepted Answer

Pyruvate

Question 5

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

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 6

Which process regenerates NAD$$^+$$ from NADH in the absence of oxygen, allowing glycolysis to continue?

Accepted Answer

Fermentation

Question 7

In the electron transport chain, what is the main function of the proton motive force (PMF)?

Accepted Answer

To drive the synthesis of ATP via ATP synthase

Question 8

Which of the following is the terminal electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 9

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP can be easily hydrolyzed to release energy for cellular work.

Question 10

Which of the following is TRUE regarding the role of NAD$$^+ in $$metabolism?

Accepted Answer

NAD$$^+ is $$reduced to NADH during catabolic reactions, carrying electrons to the electron transport chain.

Question 11

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

Direct transfer of a phosphate group to ADP from a phosphorylated intermediate.

Question 12

A bacterium is found to be oxidase positive. What does this indicate about its electron transport chain?

Accepted Answer

It uses cytochrome c oxidase as a terminal electron carrier.

Question 13

Which of the following is a key difference between prokaryotic and eukaryotic gene expression?

Accepted Answer

Prokaryotes can have polycistronic mRNA, while eukaryotes typically have monocistronic mRNA.

Question 14

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

Accepted Answer

Pyruvate

Question 15

Which of the following best describes the role of fermentation in microbial metabolism?

Accepted Answer

Fermentation regenerates NAD$$^+$$ from NADH, allowing glycolysis to continue in the absence of an electron transport chain.

Question 16

Which of the following is a real-world application of microbial fermentation?

Accepted Answer

Production of lactic acid in cheese making

Question 17

Which of the following best explains why cells must continually oxidize NADH to NAD$$^+$$ during metabolism?

Accepted Answer

To allow glycolysis and the Krebs cycle to continue by providing oxidized electron carriers

Question 18

Which of the following is a possible terminal electron acceptor in anaerobic respiration?

Accepted Answer

NO$$_3^- ($$nitrate)

Question 19

Which of the following best describes the function of the active site of an enzyme?

Accepted Answer

It is the region where substrates bind and the chemical reaction occurs.

Question 20

Which of the following statements about metabolic pathways is CORRECT?

Accepted Answer

The product of one enzyme-catalyzed reaction often serves as the substrate for the next enzyme in the pathway.

Microbial Metabolism: Fundamentals and Pathways

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