CN Nutritional Science & Biochemistry 2

Question 1

Which enzyme catalyzes the rate-limiting step of glycolysis?

Accepted Answer

Phosphofructokinase-1

Answer

Phosphofructokinase-1 is the committed, rate-limiting enzyme of glycolysis.

Question 2

Which vitamin functions as a coenzyme in the form of FAD?

Accepted Answer

Riboflavin (B2)

Answer

Riboflavin is the precursor of flavin adenine dinucleotide (FAD).

Question 3

The final electron acceptor in the mitochondrial electron transport chain is:

Accepted Answer

Oxygen

Answer

Molecular oxygen accepts electrons at complex IV to form water.

Question 4

Which amino acid is considered conditionally essential during illness or stress?

Accepted Answer

Glutamine

Answer

Glutamine becomes essential when metabolic demand exceeds synthesis capacity.

Question 5

Gluconeogenesis primarily occurs in which organ?

Accepted Answer

Liver

Answer

The liver is the main site of glucose synthesis from non-carbohydrate precursors.

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