LIFE 102 Lecture Notes - Lecture 24: Martha Chase, Molecular Genetics, Cytosine
Document Summary
*evidence for dna as the genetic material came from studies of viruses that infect bacteria. *in 1952, alfred hershey and martha chase performed experiments showing that dna is the genetic material of a phage known as t2. *to determine the source of genetic material in the phage, they designed an experiment showing that only one of the two components of t2 (dna or protein) enters an e. coli cell during infection. *after most biologists became convinced that dna was the genetic material, the challenge was to determine how its structure accounts for its role. Franklin produced a picture of the dna molecule using this technique. *in 1953, james watson and francis crick introduced an elegant double-helical model for the structure of deoxyribonucleic acid, or dna. *watson and crick reasoned that the pairing was more specific, dictated by the bas structures. In any organism, the amount of a = t and g = c.
