CAS BI 108 Lecture Notes - Lecture 2: Archaea, Bond Energy, Hydrophile
6 Jan 2017
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Document Summary
Earth was formed a little less than 4 bya. Billion years later the eukaryotes were formed (high organization of compartments but not really essential for life because the prokaryotes don"t have this and they are still living) Things shared in common between the two: outer limiting membranes, mitochondria, plasma membrane is essential for life forms because it is semi permeable so it is selective so some things can go in and out. Where does life begin: atoms small molecules large molecules, proteins, nucleic acids. Cells organism: water = 70, macromolecules = 27% o proteins. Polypeptides (poly amino acids), nucleic acids like rna and dna made up of strands of nucleotides (poly- nucleotides), carbohydrates (polysaccharides), lipids must be a little bit water soluble to be useful: ions and small molecules = 3% What are the chemical properties of bio-molecules: all must contain carbon o carbon is not water soluble (non-polar, function in aqueous environment, all bio-molecules are water soluble.
