Question 1

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

Accepted Answer

It uses a series of redox reactions to pump protons across the membrane, creating a proton gradient for ATP synthesis.

Question 2

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

Accepted Answer

$$38$$

Question 3

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

Accepted Answer

Oxygen ($$O_2)$$

Question 4

A bacterium is growing in an environment lacking oxygen but containing nitrate. Which type of respiration is it most likely performing, and what is the final electron acceptor?

Accepted Answer

Anaerobic respiration; nitrate ($$NO_3$$^-$$)

Question 5

Which of the following best explains why fermentation is necessary for some cells under anaerobic conditions?

Accepted Answer

Fermentation regenerates NAD$$^+$$, which is required for glycolysis to continue.

Question 6

Which of the following is a key difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation transfers a phosphate group directly from a substrate to ADP, while oxidative phosphorylation uses ATP synthase and a proton gradient.

Question 7

Which pathway is responsible for the majority of ATP production during aerobic respiration?

Accepted Answer

Electron transport chain and chemiosmosis

Question 8

In the Calvin-Benson cycle, what is the primary function of ribulose bisphosphate (RuBP)?

Accepted Answer

It fixes carbon dioxide in the first step of the cycle.

Question 9

Which of the following best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They are electron carriers that donate electrons to the electron transport chain.

Question 10

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

Accepted Answer

Electron transport chain

Question 11

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

Accepted Answer

NADPH

Question 12

Which of the following best describes an amphibolic pathway?

Accepted Answer

A pathway that can function in both catabolism and anabolism.

Question 13

Which of the following is NOT a function of the proton gradient established by the electron transport chain?

Accepted Answer

Directly phosphorylating glucose to glucose-6-phosphate

Question 14

Which of the following statements about the Entner-Doudoroff pathway is correct?

Accepted Answer

It is an alternative to glycolysis that yields fewer ATP and different metabolites.

Question 15

A patient presents with a genetic disorder that impairs the function of ATP synthase. Which process would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Question 16

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

Accepted Answer

To prevent the overproduction of end products and conserve resources

Question 17

Which of the following is a key feature of light-dependent reactions in photosynthesis?

Accepted Answer

They generate ATP and NADPH using light energy.

Question 18

Which of the following is a correct statement about the location of the electron transport chain in prokaryotes?

Accepted Answer

It is located in the cytoplasmic membrane.

Question 19

Which of the following best describes the role of deamination in protein catabolism?

Accepted Answer

It removes the amino group from amino acids, allowing the carbon skeleton to enter the Krebs cycle.

Question 20

A cell is observed to preferentially catabolize glucose over fatty acids when both are available. Which regulatory principle does this illustrate?

Accepted Answer

Cells catabolize the more energy-efficient substrate first.

Microbial Metabolism: Catabolic and Anabolic Pathways

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