AP BIOLOGY

Detailed explanation-1: -Suddenly, in the spring of 1953, Watson saw that the essential DNA components-four organic bases-must be linked in definite pairs. This discovery was the key factor that enabled Watson and Crick to formulate a molecular model for DNA-a double helix, which can be likened to a spiraling staircase or a twisting ladder.

Detailed explanation-2: -Created by Rosalind Franklin using a technique called X-ray crystallography, it revealed the helical shape of the DNA molecule. Watson and Crick realized that DNA was made up of two chains of nucleotide pairs that encode the genetic information for all living things.

Detailed explanation-3: -The Nobel Prize in Physiology or Medicine in 1962 was awarded to James Watson, Francis Crick and Maurice Wilkins for their discovery of the molecular structure of DNA, which helped solve one of the most important of all biological riddles.

Detailed explanation-4: -In 1962, Watson shared the Nobel Prize for Physiology or Medicine with Francis Crick and Maurice Wilkins who, with Rosalind Franklin, provided the data on which the structure was based. Watson wrote The Double Helix: A Personal Account of the Discovery of the Structure of DNA, which was published in 1968.