Question 1

Which of the following best describes the main function of the electron transport chain (ETC) in prokaryotic aerobic respiration?

Accepted Answer

To generate a proton gradient across the cytoplasmic membrane by transferring electrons through a series of carriers

Question 2

During aerobic respiration in prokaryotes, what is the total net yield of ATP from one molecule of glucose?

Accepted Answer

$$38$$

Question 3

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

Accepted Answer

Oxygen ($$O_2)$$

Question 4

What is the primary purpose of fermentation in microbial metabolism?

Accepted Answer

To regenerate NAD$$^+$$ from NADH, allowing glycolysis to continue in the absence of a functional electron transport chain

Question 5

Which of the following is a distinguishing feature of the Entner-Doudoroff pathway compared to glycolysis?

Accepted Answer

It yields different metabolites that are important for anabolic pathways

Question 6

In the light-dependent reactions of photosynthesis, what is the main role of the proton gradient?

Accepted Answer

To drive the synthesis of ATP via ATP synthase

Question 7

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It involves the direct transfer of a phosphate group from an organic molecule to ADP

Question 8

A bacterium is growing in an environment lacking oxygen but containing nitrate ($$NO_3$$^-$$). Which metabolic process is it most likely using to generate ATP?

Accepted Answer

Anaerobic respiration

Question 9

Which of the following best explains why cells regulate metabolic pathways through feedback inhibition?

Accepted Answer

To prevent the overproduction of end products and conserve resources

Question 10

Which of the following is a key step in the Calvin-Benson cycle during photosynthesis?

Accepted Answer

Fixation of $$CO_2 to $$ribulose bisphosphate (RuBP)

Question 11

A mutation in a bacterium prevents the synthesis of cytochromes. Which process would be most directly affected?

Accepted Answer

Electron transport chain

Question 12

Which of the following is an example of an amphibolic pathway?

Accepted Answer

Glycolysis

Question 13

Which of the following is NOT a carrier molecule in the electron transport chain?

Accepted Answer

ATP synthase

Question 14

In which cellular location does the electron transport chain occur in prokaryotes?

Accepted Answer

Cytoplasmic membrane

Question 15

Which of the following best describes the role of NAD$$^+ in $$cellular metabolism?

Accepted Answer

It serves as an electron carrier, accepting electrons during glycolysis and the Krebs cycle

Question 16

Which of the following statements about the pentose phosphate pathway is correct?

Accepted Answer

It generates NADPH and ribose-5-phosphate for anabolic reactions

Question 17

A cell is exposed to a toxin that inhibits ATP synthase. Which process would be most directly impaired?

Accepted Answer

Oxidative phosphorylation

Question 18

Which of the following is a direct product of noncyclic photophosphorylation in photosynthesis?

Accepted Answer

NADPH

Question 19

Which regulatory mechanism allows a cell to control the amount and timing of enzyme production?

Accepted Answer

Control of gene expression

Question 20

Which of the following best explains why cells prefer to catabolize glucose before other energy sources?

Accepted Answer

Glucose catabolism yields the most ATP per molecule compared to other substrates

Microbial Metabolism: Catabolic and Anabolic Pathways

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