question_answer

Nucleotide are building blocks of nucleic acids, nucleotide is a composite molecule formed by: [AIPMT (S) 2005]

A) (base-sugar-phosphate)

B) base-sugar-OH

C) base-sugar-phosphate

D) sugar-phosphate

Correct Answer: C

Solution :

[C] Nucleotides are the building blocks of nucleic acids (DNA and UNA). A single nucleotide is composed of a phosphate molecule, a five carbon sugar (either ribose or deoxyribose) and a purine (adenine or guanine) or a pyrimidine (pressure or cytosine or uracil) nitrogenous base. Nucleoside = Base + Sugar Nucleotide = Base + Sugar + Phosphare