Biology 1002B Lecture Notes - Lecture 10: Genome Size, Nuclear Membrane, Nuclear Dna
15 Mar 2013
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Archaea don"t show very much morphological complexity, not as much as eucarya. Bacteria can perform interesting biochemical functions, but this doesn"t reflect intense complexity. Prokaryotes show no tendency at all to develop these types of morphological/cellular complexity. Why don"t they if evolution is stepwise and gradual. Oxygen is the key, the ability to use oxygen was the drive. Uses glycolysis and fermentation to make atp (this does not make very much. Atp, so they didn"t have enough atp for major functions ) 2. 2 bya cyanobacteria developed and they were able to use oxygenic photosynthesis to split water into oxygen and protons. Produced oxygen and evolved oxygen and released it into the atmosphere. This eventually increased the concentration of oxygen in the atmosphere. Lots more atp was produced and this allowed for more functions on the part of the cell. Archaea and bacteria are 1000s of times smaller than eukarya.
