Precursors are substances from which an active substance is formed. Nonessential nutrients cannot be synthesized from other substances.

Precursors are substances from which an active substance is formed. Nonessential nutrients cannot be synthesized from other substances.

a.
Both statements are true.
b.
Both statements are false.
c.
The first statement is true; the second is false.
d.
The first statement is false; the second is true.

ANS:  C

Nonessential nutrients can be used by the body; they either are not required or can be synthesized from dietary precursors. Carotene is a precursor to vitamin A. It is found in fruits and vegetables and is converted to an active form of vitamin A by the liver.