Question

Nucleotide are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by

(a) base-sugar-phosphate

(b) base-sugar-OH

(c) (base-sugar-phosphate)_n

(d) sugar-phosphate

Answer 1

Correct option  (a) base-sugar-phosphate

Explanation : 

Nucleotide are the building blocks of nucleic acids (DNA and RNA). 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(thymine or cytosine or uracil) nitrogenous base.

                    Chemical structures of base pairs and sugar phosphate chains