Q: Which of the following statements about fermentation is correct?

Fermentation requires a constant source of NAD\textsuperscript{+} to continue.

Question 1

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

Accepted Answer

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

Question 2

During glycolysis, which process is responsible for the direct formation of ATP?

Accepted Answer

Substrate-level phosphorylation

Question 3

Which of the following is the ultimate function of metabolism in a microbial cell?

Accepted Answer

To reproduce the organism

Question 4

Which electron carrier is reduced during the Krebs cycle and is later used in the electron transport chain?

Accepted Answer

NAD	extsuperscript{+}

Question 5

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and blocking substrate binding

Question 6

Which of the following equations correctly represents the overall reaction for aerobic respiration in prokaryotes?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 + 38ADP + 38P_i \rightarrow 6CO_2 + 6H_2O + 38ATP$$

Question 7

Which metabolic pathway is primarily responsible for generating NADPH and ribose-5-phosphate for anabolic reactions?

Accepted Answer

Pentose phosphate pathway

Question 8

In feedback inhibition, the end product of a metabolic pathway:

Accepted Answer

Binds to an allosteric site on an enzyme earlier in the pathway, reducing its activity

Question 9

Which process in microbial metabolism is most directly responsible for the formation of a proton gradient across a membrane?

Accepted Answer

Electron transport chain

Question 10

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation requires a constant source of NAD	extsuperscript{+} to continue.

Question 11

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

Accepted Answer

Hydrolysis phosphorylation

Question 12

A bacterium is found to use light energy and CO	extsubscript{2} as its carbon source. Which nutritional type does it belong to?

Accepted Answer

Photoautotroph

Question 13

Which of the following is a correct description of the role of enzymes in metabolism?

Accepted Answer

Enzymes lower the activation energy, speeding up chemical reactions.

Question 14

Which process is responsible for the conversion of pyruvic acid to acetyl-CoA in cellular respiration?

Accepted Answer

Decarboxylation

Question 15

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

Accepted Answer

ATP

Question 16

Which metabolic process is used by cells to synthesize glucose from non-carbohydrate precursors?

Accepted Answer

Gluconeogenesis

Question 17

Which of the following statements about the electron transport chain (ETC) is true?

Accepted Answer

The ETC uses electron carriers to transfer electrons to the final electron acceptor.

Question 18

Which of the following is a correct equation for the reduction of NAD	extsuperscript{+}?

Accepted Answer

$$NAD^+ + 2e^- + 2H^+ \rightarrow NADH + H^+$$

Question 19

A bacterium is able to grow using nitrate (NO	extsubscript{3}	extsuperscript{-}) as its final electron acceptor in respiration. This process is best described as:

Accepted Answer

Anaerobic respiration

Microbial Metabolism: Pathways, Energy, and Regulation

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