Biology 1002B Lecture Notes - Lecture 2: Homochirality, Abiogenesis, Antiemetic
21 Feb 2017
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Bacteria, archaea, eukaryotes all branched from a single luca (approx. 4 bya- life started, earth is 4. 6 billion years old. Sugars, amino acids, nucleotides)- synthesize in the absence of a biological system. Heritable information- info transferred to daughter cells. Biological stage: how did the building blocks organize into living cells, not sure how the first cells were formed. Miller urey experiment: contain gases that are easy to oxidize (lose e-) Early atmosphere- reducing atmosphere & energy: be able to add molecules/atoms, need energy to break bonds- lightning, after a week, amino acids, sugars, etc (building blocks of life) was produced. Monomers, not polymers: dna, rna, proteins are polymers, monomers- amino acids, nucleotides. (cid:862)ha(cid:374)ded(cid:374)ess(cid:863)- lh and rh are not superimposable. Same chemical & physical properties, but different biological properties: ex. Thalidomide (used as antiemetic: children were born with missing limbs, etc, teratogen vs antiemetic- 50/50 each. All life: l amino acids, d sugars.
