Write the structures of fragments produced on complete hydrolysis of DNA. How are they linked in DNA molecule? Draw a diagram to show pairing of nucleotide bases in double helix of DNA.

The complete hydrolysis of DNA molecule yields a pentose sugar, phosphoric acid and nitrogen containing heterocyclic biological compound called bases.

Ribose

Deoxyribose

Phosphoric acid

The four nitrogenous bases produced are – Adenine(A), Guanine(G), Cytosine(C), Thymine(T).

Adenine

Guanine

Cytosine

Thymine

Adenine-Thymine pairing

Guanine-Cytosine pairing

Pairing of nucleotides in a DNA molecule

Double helical structure of DNA