BIO 200 Lecture Notes - Lecture 3: Panspermia, Reducing Atmosphere, Homeostasis
23 Nov 2016
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Four main time periods in the earth"s history that you need to know. Make time lines to remember the events that happened. Achea and bacteria (3. 8 billion years ago) Life has 2 characteristics: organization , replicates itself , cellular organization, development, regulation, homeostasis. Molten rock too hot to colonize, must have all been aquatic early life. Four steps: building block of life organic materials. Amino acids stuck together become proteins, nucleotides make dna strand. Happens spontaneously but monomers have to find each other first. Clay in ocean shore, monomers attracted to it bc of iron and zinc richness: formation of protobionts. Everything inside protobiont is stuck together and not dispersed: origin of hereditary material aqueous cavity can hold chemicals starts to look like a cell. surrounded by membrane like structure first material was rna. Why rna? can be formed abiotically easier than dna can replicate itself.
