ACBN ACBN Nutrition Science Fundamentals 1

Question 1

Which macronutrient provides 4 kcal per gram and serves as the primary energy source for the brain?

Accepted Answer

Carbohydrates

Answer

Carbohydrates provide 4 kcal/g and glucose derived from them is the preferred fuel for brain function.

Question 2

The Recommended Dietary Allowance (RDA) for protein in healthy adults is approximately:

Accepted Answer

0.8 g/kg body weight/day

Answer

The RDA for protein in healthy adults is 0.8 g/kg body weight per day as established by the DRI.

Question 3

Which vitamin is synthesized in the skin upon exposure to ultraviolet B (UVB) radiation?

Accepted Answer

Vitamin D

Answer

Vitamin D3 (cholecalciferol) is synthesized in the skin from 7-dehydrocholesterol when exposed to UVB radiation.

Question 4

The process by which fatty acids are broken down to produce acetyl-CoA for energy is called:

Accepted Answer

Beta-oxidation

Answer

Beta-oxidation is the metabolic pathway in the mitochondria that sequentially cleaves two-carbon units from fatty acid chains.

Question 5

Which mineral is a cofactor for over 300 enzymatic reactions and is found abundantly in nuts and whole grains?

Accepted Answer

Magnesium

Answer

Magnesium serves as a cofactor in over 300 enzyme systems and is particularly abundant in nuts, seeds, and whole grains.

ACBN - Nutritionist Exam Practice Test