Biology 1002B Lecture Notes - Lecture 12: Noncoding Dna, Euglena, Genome Size
27 Feb 2017
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Earliest bacteria were anaerobic (there was no oxygen in the atmosphere) Then cyanobacteria developped; we get oxygenic photosynthesis. Drives the evolution of bacteria that undergo aerobic respiration. Identify the paradox for why prokaryotes are biochemical complex don"t develop morphological complexity. Big difference is the ability of eukaryotes to drive more energy than prokaryotes. Bacteria lack the complexity that you find in eukaryotes if evolution is stepwise then why are archaea and bacteria stuck in their simple life: morphological complexity is only found in eukaryotes. Complexity essentially comes down to eukaryote"s ability to be more energy efficient. Relationship between surface area and volume as cells get larger. Volume increases much faster than surface area does. It takes much more energy to support the bigger volume but you don"t increase your surface area very much; can"t have as many oxidative phosphorylation units. Eukaryotes have giant membrane surface area; hundreds of mitochondria per cell so you have lots of oxidative phosphorylation units.
