Watson and Crick model of DNA

The Watson and Crick model of DNA, proposed in 1953, describes DNA's structure as a double helix, akin to a twisted ladder. The sides of the ladder are made of sugar and phosphate molecules, while the rungs consist of paired nitrogenous bases (adenine with thymine, and guanine with cytosine). This pairing is specific and helps ensure accurate DNA replication. Their model revealed how genetic information is stored and transmitted in living organisms, fundamentally changing our understanding of biology and genetics. The discovery of DNA’s structure laid the foundation for molecular biology and genetic research.