Q: Which equation represents oxygenic photosynthesis?

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

Question 1

Which of the following best describes the difference between catabolic and anabolic reactions in microbial metabolism?

Accepted Answer

Catabolic reactions break down complex molecules and release energy, while anabolic reactions use energy to build complex molecules.

Question 2

A scientist increases the temperature of a bacterial culture from 30°C to 50°C. According to the enzyme activity graph, what is the most likely outcome for the rate of an enzyme-catalyzed reaction?

Accepted Answer

The reaction rate will decrease due to enzyme denaturation at high temperature.

Question 3

Which equation correctly represents the process of substrate-level phosphorylation?

Accepted Answer

$$\mathrm{ADP} + \mathrm{PO}_4$$^{3-}$$ \rightarrow \mathrm{ATP}$$

Question 4

Which of the following statements about enzyme specificity is correct?

Accepted Answer

Enzymes are specific to particular substrates due to the shape of their active site.

Question 5

A competitive inhibitor affects an enzyme by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 6

Which of the following is an example of a redox reaction in cellular metabolism?

Accepted Answer

$$\mathrm{NAD}^+ + 2\mathrm{H} \rightarrow \mathrm{NADH} + \mathrm{H}^+$$

Question 7

Which component is required for an apoenzyme to become an active holoenzyme?

Accepted Answer

A cofactor or coenzyme

Question 8

Which of the following best explains feedback inhibition in a metabolic pathway?

Accepted Answer

The end-product binds to an enzyme early in the pathway, allosterically inhibiting it.

Question 9

During glycolysis, how many net ATP molecules are produced per glucose molecule?

Accepted Answer

2

Question 10

Which pathway operates simultaneously with glycolysis and produces NADPH, providing intermediates for biosynthesis?

Accepted Answer

Pentose phosphate pathway

Question 11

In aerobic respiration, what is the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$\mathrm{O}_2)$$

Question 12

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation uses an organic molecule as the final electron acceptor and produces small amounts of ATP.

Question 13

Which equation represents oxygenic photosynthesis?

Accepted Answer

$$6\mathrm{CO}_2 + 12\mathrm{H}_2\mathrm{O} + 	ext{Light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{H}_2\mathrm{O} + 6\mathrm{O}_2$$

Question 14

Which of the following is a characteristic of chemoheterotrophs?

Accepted Answer

They obtain energy and carbon from organic chemicals.

Question 15

Which of the following best describes the process of chemiosmosis?

Accepted Answer

ATP is generated from ADP using energy derived from the electron transport chain and a proton gradient.

Question 16

Which of the following is NOT a function of ribozymes?

Accepted Answer

Being used up in the reaction

Question 17

Which of the following is true about the Entner-Doudoroff pathway?

Accepted Answer

It produces NADPH and ATP, and does not involve glycolysis.

Question 18

Which of the following best describes an amphibolic pathway?

Accepted Answer

A pathway that functions in both anabolism and catabolism.

Question 19

Which of the following is a correct statement about the ATP yield from prokaryotic aerobic respiration of one glucose molecule?

Accepted Answer

A total of 38 ATP molecules are produced.

Microbial Metabolism: Structured Study Notes for Microbiology Students

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