Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

$$2$$

Question 3

Which molecule acts as the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 4

What is the main purpose of fermentation in microbial cells?

Accepted Answer

To regenerate $$NAD^+$$ for glycolysis in the absence of a functional electron transport chain

Question 5

Which of the following electron carriers is NOT commonly used in microbial redox reactions?

Accepted Answer

Glucose

Question 6

In substrate-level phosphorylation, how is ATP generated?

Accepted Answer

By transferring a phosphate group directly from a substrate to ADP

Question 7

A patient presents with gangrene caused by Clostridium perfringens. Which metabolic pathway is most likely responsible for the production of gas in the infected tissue?

Accepted Answer

Fermentation

Question 8

Which of the following statements about the electron transport chain (ETC) in prokaryotes is correct?

Accepted Answer

The ETC is located in the cytoplasmic membrane.

Question 9

What is the total theoretical yield of ATP from one molecule of glucose during ideal prokaryotic aerobic respiration?

Accepted Answer

$$38$$

Question 10

Which process is responsible for the direct transfer of a phosphate group from phosphoenolpyruvate (PEP) to ADP, forming ATP?

Accepted Answer

Substrate-level phosphorylation

Question 11

During the formation of acetyl-CoA from pyruvic acid, which of the following occurs?

Accepted Answer

Pyruvic acid is decarboxylated and combined with coenzyme A.

Question 12

Which of the following is a correct description of a redox reaction in microbial metabolism?

Accepted Answer

The electron donor is oxidized and the electron acceptor is reduced.

Question 13

Which of the following is NOT a product of glycolysis?

Accepted Answer

FADH$$_2$$

Question 14

In the Krebs cycle, which molecule is regenerated to continue the cycle?

Accepted Answer

Oxaloacetate

Question 15

Which of the following statements about anaerobic respiration is TRUE?

Accepted Answer

It yields less ATP than aerobic respiration but more than fermentation.

Question 16

Which metabolic pathway is responsible for the complete oxidation of glucose to $$CO_2$$ and $$H_2O$$?

Accepted Answer

Aerobic respiration

Question 17

Which of the following is a major function of ATP in microbial cells?

Accepted Answer

Providing energy for anabolic reactions

Question 18

Which of the following best explains why fermentation yields less ATP than aerobic respiration?

Accepted Answer

Fermentation does not fully oxidize glucose and lacks an electron transport chain.

Question 19

Which of the following is a common misconception about the electron transport chain?

Accepted Answer

It is only involved in fermentation.

Question 20

A bacterium is found to use nitrate ($$NO_3$$^-$$) as its final electron acceptor. Which metabolic process is it performing?

Accepted Answer

Anaerobic respiration

Microbial Metabolism: Catabolism, Anabolism, and Redox Reactions

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