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

$$\mathrm{ADP} + \mathrm{P_i} + \text{energy} \rightarrow \mathrm{ATP}$$

Question 1

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

Accepted Answer

To reproduce the organism

Question 2

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

Accepted Answer

2 ATP, 2 NADH

Question 3

Which of the following statements about catabolic and anabolic pathways is correct?

Accepted Answer

Catabolic pathways are exergonic and break down large molecules.

Question 4

A patient is exposed to a toxin that inhibits the electron transport chain in mitochondria. Which process will be directly affected, and what is the expected consequence?

Accepted Answer

Oxidative phosphorylation; decreased ATP synthesis

Question 5

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

Accepted Answer

$$\mathrm{ADP} + \mathrm{P_i} + 	ext{energy} ightarrow \mathrm{ATP}$$

Question 6

Which of the following is NOT a function of electron carriers such as NAD+, NADP+, and FAD in microbial metabolism?

Accepted Answer

They act as final electron acceptors in fermentation.

Question 7

A researcher increases the temperature of a bacterial culture from 37°C to 60°C. What is the most likely effect on the enzymes in the culture?

Accepted Answer

Enzymes will denature, losing their functional shape.

Question 8

Which of the following best explains the role of allosteric activators in enzyme regulation?

Accepted Answer

They bind to an allosteric site, causing the active site to become functional.

Question 9

In the context of feedback inhibition, what happens when the end product of a metabolic pathway accumulates?

Accepted Answer

The pathway is shut down by inhibition of an early enzyme.

Question 10

Which of the following is a correct description of the fate of pyruvic acid in the absence of oxygen in a typical bacterial cell?

Accepted Answer

It is reduced to fermentation products such as lactic acid or ethanol.

Question 11

Which of the following best describes the process of chemiosmosis in cellular respiration?

Accepted Answer

The use of a proton gradient to drive ATP synthesis via ATP synthase

Question 12

A mutation in a bacterium prevents the regeneration of NAD+ during fermentation. What is the most likely consequence for the cell?

Accepted Answer

Glycolysis will stop due to lack of NAD+.

Question 13

Which of the following is the correct sequence of events in aerobic respiration?

Accepted Answer

Glycolysis → Krebs cycle → Electron transport chain

Question 14

Which of the following statements about photosynthesis in prokaryotes is correct?

Accepted Answer

Photosystems are embedded in the infoldings of the cytoplasmic membrane.

Question 15

Which of the following equations represents the overall reaction of the Calvin-Benson cycle?

Accepted Answer

$$6 \mathrm{CO}_2 + 18 \mathrm{ATP} + 12 \mathrm{NADPH} + 12 \mathrm{H}^+ \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 18 \mathrm{ADP} + 18 \mathrm{P_i} + 12 \mathrm{NADP}^+ + 6 \mathrm{H}_2O$$

Question 16

A bacterial cell is placed in an environment with a pH of 3. What is the most likely effect on its enzymes?

Accepted Answer

Enzyme activity will decrease due to denaturation.

Question 17

Which of the following is a key difference between competitive and noncompetitive enzyme inhibitors?

Accepted Answer

Competitive inhibitors bind to the active site, while noncompetitive inhibitors bind to an allosteric site.

Question 18

Which of the following best explains why oxygen is required for aerobic respiration?

Accepted Answer

Oxygen serves as the final electron acceptor in the electron transport chain.

Question 19

A mutation causes a bacterium to lack the enzyme ATP synthase. Which process will be most directly affected?

Accepted Answer

Oxidative phosphorylation

Microbial Metabolism: Structured Study Notes

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