NATS 1760 Chapter Notes -S. Barry Barnes, Thymine, Guanine
20 Jun 2013
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Excerpt from genomes & what to make of them (pg. Genes are material objects defined and identified in terms of function. Scientists identified genetic material in chromosomes, but then realized that dna possessed same attributes. Stereochemical structure of dna by watson & crick in 1953. Helical model of dna showed how the molecule can incorporate systematic variations but it also suggested a possible mode of replication of the molecule that preserves that variation intact. Derived from four components: adenine, cytosine, guanine, thymine. Watson- crick model identified the organic bases as strung out along a stable linear chain in ordered sequence, with two such chains linked together in parallel through a weak form of chemical bonding (double helix model) Thymine (t) always to adenine (a), and cytosine (c) always to guanine (g) Two key functions of dna: it must replicate and in this process letters of the text are read" single rather as instructions are read.
