Question

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

 

1. How many strands are shown in the diagram?
2. How many nucleotides have been shown in each strand?
3. Name the parts numbered 1, 2, 3, 4 and 5 respectively.
4. Name the DNA unit constituted by the parts 1, 2, 3 collectively.

Answer 1

1. Two parallel strands.
2. Two on each strand.
3. (1) Phosphate, (2) Sugar, (3) Pyrimidines, (4) Hydrogen Bond and (5) Purines.
4. Nucleotides.