Question

Draw only a labelled diagram of DNA double helix model as proposed by Watson and Crick.

Hint:

Always label base pairs, hydrogen bonds, and sugar-phosphate backbone clearly in DNA diagrams.

Answer 1

The Watson and Crick model of DNA shows a double helix structure in which:
- Two polynucleotide chains are coiled around each other.
- The sugar-phosphate backbone lies outside.
- Nitrogenous bases (A-T, G-C) pair through hydrogen bonds.
- The helix is right-handed.
Labelled Diagram: \[ \text{(Here you should draw a neat, labelled diagram showing: Sugar-Phosphate backbone, A-T base pair, G-C base pair, hydrogen bonds, double helix structure.)} \]