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100 Years of Science

D. Carrigan - Fermilab                                                        July 7, 2004

20

DNA, Darwin, and Dirt

T

The evolution of the geology of earth including impacts

and the atmosphere drives the environments

Survival of the Fittest for different environments explains evolution

DNA (~1953) Proteins have 20 amino acids. There are 4 bases in DNA (adenine[A], guanine[G], cytosine[C], thymine[T]). Combinations are AT (2 hydrogen bonds) and GC (three hydrogen bonds). The number of bits/base pair is 4.32/3= 1.44 bits/bp = ln_2(20)/3 where 3 is the number of base pairs in a codon (a triplet of base pairs). 600 Daltons for mass of a base pair with backbone and bonds. Human genome-3 billion DNA base pairs, actual information content is on the order of 0.05 Gbytes because of junk DNA. Point- lots of information per mass.

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