Answer the following questions:
(i) Why are vitamin A and vitamin C essential for us?
(ii) What is the difference between a nucleoside and a nucleotide?

Explanation

(i)Vitamin A is required for growth and vision in human beings and increase resistance to disease
Vitamin C: It increases the resistacne of body to wards disease maintain healthg skin and heps cuts and abrasions to heal properly
(ii) A nucleoside consists of a netirogenouss base covalently attached to a sugar (ribose or deoxyrobose) but without the phosphate group. A mucleotide consists of a nitrogenous base a sugar (ribose or deoxuyribose) and one to three phosphate groups
Nucleoside = sugar + Base
Nucleotide =Sugar +Base +Phosphate