DNA Structure (Watson & Crick)

The Watson and Crick model describes DNA as a double helix, resembling a twisted ladder. Its sides are made of sugar and phosphate molecules, while the rungs consist of pairs of nitrogen bases (adenine with thymine, and cytosine with guanine). The bases connect through specific pairs via hydrogen bonds, holding the two strands together. This structure allows DNA to store genetic information securely and enables it to be copied accurately during cell division. The double helix is both stable and flexible, facilitating essential biological processes like replication and protein synthesis.