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Home > 25. Early Earth and Life Processes > DNA
Podcast: 25. Early Earth and Life Processes
Episode:

DNA
Category: Science & Medicine
Duration: 00:00:55
Publish Date: 2011-07-28 08:46:58
Description: Transcript: The blueprint of life on Earth is DNA and its close relative RNA. DNA, deoxyribonucleic acid, is a long polymer in the form of a double helix. Its structure was first worked out by James Watson and Frances Crick in 1953. DNA has two long strands and rungs connecting the strands. Each rung is a series of base pairs. There are four bases; adenine, cytosine, guanine, and thymine, A, C, G, T abbreviated, that form the sequence of base pairs. The rules for the connection of the two sides of the ladder are that A can only connect to T and G can only connect to C, and in this way when DNA splits and recombines, the information is transcribed. This is the basis of the genetic code.
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