Biology 1002B Lecture Notes - Lecture 10: Horizontal Gene Transfer, Noncoding Dna, Electron Acceptor
20 Mar 2016
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Class 10: evoluion of the eukaryoic cell: factors driving development of aerobic cells. Cells were originally anaerobic (prokaryoic cells) (4 bya) Cyanobacteria evolved to perform oxygenic photosynthesis (2. 2 bya: spliing of water increased oxygen gas in the atmosphere. Oxygen is a great terminal electron acceptor: bacteria that undergo aerobic respiraion evolve, advantageous to be an aerobic cell because much more atp is synthesized per glucose molecule due to ox/phos. Idenify the paradox for why prokaryotes are biochemically complex don"t develop morphological complexity. Morphological complexity = cells with diferent funcions. Biochemical complexity: have evolved biochemically to adapt to diferent temperatures, capable of synthesizing molecules that eukaryotes don"t, relaionship between surface area and volume as cells get larger. When a cell gets bigger, its volume increases faster than its area: a lot of energy is required to support this increase in volume. Potenial energy diference across a membrane used to do work.
