CN Nutritional Science & Biochemistry 3

Question 1

Which mineral is a central component of the heme group in hemoglobin?

Accepted Answer

Iron

Answer

Iron binds oxygen within the heme prosthetic group of hemoglobin.

Question 2

Vitamin C is required as a cofactor for the hydroxylation of which structural protein?

Accepted Answer

Collagen

Answer

Vitamin C is a cofactor for prolyl and lysyl hydroxylases in collagen synthesis.

Question 3

Which of the following is a ketone body produced during prolonged fasting?

Accepted Answer

Beta-hydroxybutyrate

Answer

Beta-hydroxybutyrate is a major ketone body used as fuel during fasting.

Question 4

The Krebs (citric acid) cycle takes place in which cellular compartment?

Accepted Answer

Mitochondrial matrix

Answer

The citric acid cycle enzymes are located in the mitochondrial matrix.

Question 5

Which fat-soluble vitamin is synthesized in the skin upon UV exposure?

Accepted Answer

Vitamin D

Answer

Vitamin D is produced from 7-dehydrocholesterol when skin is exposed to UVB light.

(CN) Certified Nutritionist Practice Test