Question

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

• A. (base-sugar-phosphate)n
• B. base-sugar-OH.
• C. base-sugar-phosphate
• D. sugar-phosphate.

Answer 1

The correct option is C base-sugar-phosphate

Structure of a nucleotide
A nucleotide is composed of a nitrogenous base, pentose sugar and a phosphate group. The nitrogenous base is attached to the 1’ carbon of the pentose sugar with the help of a N-glycosidic linkage. The phosphate is attached to the hydroxyl (-OH) group of the 5’ carbon of the pentose sugar with the help of a phosphoester bond.

Final answer
(A) base-sugar-phosphate