IIN Macronutrient & Micronutrient Science 3

Question 1

Which fat-soluble vitamin is produced in the skin upon exposure to ultraviolet B radiation from sunlight?

Accepted Answer

Vitamin D

Answer

UVB radiation converts 7-dehydrocholesterol in the skin to previtamin D3, which is then converted to cholecalciferol (vitamin D3).

Question 2

Glycogen, the storage form of carbohydrate in humans, is primarily stored in which two tissues?

Accepted Answer

Liver and skeletal muscle

Answer

The liver stores glycogen to maintain blood glucose levels, while skeletal muscle stores glycogen for local energy use during activity.

Question 3

Which water-soluble B vitamin serves as a coenzyme in energy metabolism and is found in high concentrations in brewer's yeast and whole grains?

Accepted Answer

Thiamine (B1)

Answer

Thiamine (B1) is a coenzyme in pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase, key enzymes in carbohydrate energy metabolism.

Question 4

Which term describes a protein that contains all nine essential amino acids in adequate proportions?

Accepted Answer

Complete protein

Answer

A complete protein contains all nine essential amino acids in sufficient quantities to support human protein synthesis.

Question 5

Excess dietary protein that is not needed for tissue synthesis is primarily metabolized by which process?

Accepted Answer

Converted to fatty acids or glucose after deamination

Answer

Amino acids are deaminated, and their carbon skeletons enter metabolic pathways to be converted to glucose (gluconeogenesis) or fatty acids for energy or storage.

(IIN) Institute for Integrative Nutrition Certification Practice Test

(IIN) Institute for Integrative Nutrition Certification Practice Test

IIN Macronutrient & Micronutrient Science 3