Question

Vitamins are essential nutrients for cells because they cannot be synthesized by the animal itself, and most:

a. are essential macronutrients.

b. are metabolized into essential amino acids.

c. are used as an energy source.

d. function as enzymes to digest foods.

e. function as coenzymes or parts of coenzymes.

Answer 1

Vitamins are

a. are essential macronutrients- false

(Vitamins required in a very small amount, and hence they are micronutrients not macronutrient)   

b. are metabolized into essential amino acids-- false

(They do not metabolized into amino acids)

c. are used as an energy source.-- false

(Macronutrients such as carbohydrat, proteins fats are used as energy source not vitamins   

d. function as enzymes to digest foods.-- false

(Enzymes are proteins in nature, vitamins are not proteins and can not be function as enzyme)

e. function as coenzymes or parts of coenzymes -- true

( Vitamins can serve as cofactors or coenzyme for many enzymatic activities. For example Pantothenic acid (PA) is a vitamin B, which is a constituents of coenzyme A, requires in the carbohydrates, amino acids, fatty acids metabolism