Watson and Crick are best known for their discovery related to what structure?

• A. Cell membrane
• B. DNA structure
• C. Protein synthesis
• D. Chromosomal theory

Answer: (B)

Watson and Crick are best known for their groundbreaking discovery of the double helix structure of DNA. This model, proposed in 1953, provided a revolutionary understanding of how genetic information is stored, replicated, and transmitted in living organisms. The double helix consists of two strands of nucleotides that coil around each other, with the specific pairing of the nitrogenous bases (adenine with thymine and guanine with cytosine) forming the rungs of the ladder-like structure. Their work laid the foundation for modern genetics and molecular biology, influencing numerous fields, including biochemistry, medicine, and forensic science. This discovery is often considered one of the most significant scientific achievements of the 20th century, as it elucidated the molecular underpinnings of heredity and variation.