BIOL359 Chapter Notes -Cambrian Explosion, Tetrahymena, Big Bang
11 Jan 2015
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Rna important because it is made of ribosomes, which are sight of dna translation, and ribosomes built on rna backbone. This molecule has different fitnesses, forms different rates and contributions to next generation. Ammonia, methane and hydrogen = most imp constituents of the earth early atmosphere. Don"t know how early life was, have null model = oparin haldane model. Proteins = can perform many tasks but cannot propagate themselves. Cant store or transmit info needed to replicate. Dna = perfectly suited to store and transmit genetic info by comp base pairs, but cant do any biological work. Rna = can have genotype and phenotype, genotype = primary sequence. Rna arose from an abiotic env from alien sources. Amino acids = two forms, r and l, we use l form. Meteorites that came had both forms, r and l. Universe created with big bang, solar system condenses, earth is 4. 5bya. Cenancestor = most recent ancestor of life forms we see today.
