Watson and Crick are associated with ?
**Core Concept**
The question refers to the discovery of the structure of **DNA (Deoxyribonucleic acid)**, a fundamental concept in molecular biology. James Watson and Francis Crick are renowned for their work on the double helix model of DNA. This discovery revolutionized the field of genetics and molecular biology.
**Why the Correct Answer is Right**
Watson and Crick's model, published in 1953, described the double helix structure of DNA, where two strands of nucleotides are twisted together. Their work built upon the findings of Rosalind Franklin and Maurice Wilkins, who provided crucial X-ray crystallography data. The double helix model explained how genetic information is stored and replicated.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because, although related to biology, it is not specifically associated with Watson and Crick.
**Option B:** Incorrect as it is unrelated to the discovery of the DNA structure.
**Option C:** Incorrect because, while important in biology, it does not pertain to Watson and Crick's work.
**Clinical Pearl / High-Yield Fact**
The discovery of the DNA structure by Watson and Crick is a cornerstone of modern genetics and has far-reaching implications for fields such as genetic engineering and forensic science.
**Correct Answer:** D. Discovery of the structure of DNA