Lecture 14 Vitamin D - MC

Question 1

*Vitamin D contains compounds known as:
A) Polysaccharides
B) Seco-steroids
C) Triglycerides
D) Amino acids

Answer 1

B

Question 2

*Which of the following is NOT a main form of Vitamin D?
A) Ergocalciferol (Vitamin D2)
B) Cholecalciferol (Vitamin D3)
C) Calcitriol
D) Ascorbic acid

Answer 2

D

Question 3

Ergocalciferol is primarily found in:
A) Animal products
B) UVB light exposure
C) Plant foods
D) Water sources

Answer 3

C

Question 4

Cholecalciferol is synthesized in the skin of humans through:
A) Direct ingestion of fortified foods
B) Exposure to UVB light from the sun
C) Conversion from dietary fats
D) Digestion of plant sterols

Answer 4

B

Question 5

*Which organ is responsible for converting 25-OHD3 into 1,25-OHD3 (calcitriol)?
A) Heart
B) Liver
C) Kidney
D) Pancreas

Answer 5

B

Question 6

*What is the role of calcitriol, the active form of Vitamin D?
A) To decrease calcium resorption from the bone
B) To prevent the absorption of calcium into the intestine
C) To increase calcium resorption from the bone and its absorption in the intestine
D) To eliminate excess calcium from the body

Answer 6

C

Question 7

What triggers the initial step in the synthesis of Vitamin D3 in the skin?
A) Exposure to cold temperatures
B) Absorption of dietary minerals
C) Exposure to UVB light from the sun
D) Hydration with water

Answer 7

C