Given below is a schematic diagram of a portion of DNA.

(a) How many strands are shown in the diagram?

(b) How many nucleotides have been shown in each strand?

(c) Name the parts numbered 1,2,3,4 and 5 respectively.

(d) Name the DNA unit constituted by the parts 1, 2 and 3 collectively.

Answers:

(a)2 strands

(b) 2 nucleotides

(c) 1 – Phosphate

2 – Sugar

3 – Bases

4 – Hydrogen Bond

5 – Base

(d) Nucleotide