Question

The precursor of vitamin D is:
A.Cholesterol
B.Arachidonic acid
C.Triacylglycerol
D.Phospholipids

Answer 1

A precursor is a compound that participates in a chemical reaction that produces another compound. It often refers more specially to a chemical compound preceding another in a metabolic pathway.

Complete step by step answer:
-Vitamin D is a fat-soluble vitamin that is naturally present in very few foods, added to others, and available as a dietary supplement. It is also produced endogenously when ultraviolet rays from sunlight strike the skin and trigger vitamin D synthesis.
-Cholesterol serves as a precursor for the biosynthesis of steroid hormone, bile acid and vitamin D.
-It is the principal sterol synthesized by all animals. In vertebrates, hepatic cells typically produce the greatest amounts.
-The chemical formula for cholesterol is ${C_{27}}{H_{46}}O.$
-The cholesterol and other facts are carried in the bloodstream as spherical particles known as lipoproteins.

Hence, option A is correct.

Note:
Vitamin D deficiency can lead to a loss of bone density, which can contribute to osteoporosis and fractures (broken bones). In children, it can cause rickets. Rickets is a rare disease that causes the bones to become soft and bend.