Biology 1002B Lecture Notes - Lecture 10: Nuclear Membrane, Phos, Cell Membrane
23 May 2013
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Morphology, cellular structure, processes are all complex. Show no tendency to form organelles no complexity. Need centers for energy b. c. as v of cell increases protein and energy demand increases: problem: as cell gets bigger - v increases much faster than sa. Can"t fill plasma membrane with enough ox phos centers to fulfill ever-increasing v. therefore, bacteria size stays small. Bacteria: high pm sa/v constrains size. Energy constrains complexity need energy to synthesize proteins for complex functioning. Genome size is low energy so simple organisms can have very large genomes however it takes energy to maintain genome size so proks keep genome size small. All eukaryotes share common complex traits: nucleus, trafficking, cytoskeleton, sex, phagocytosis, organelles, etc. Meaning of endosymbiosis, cyanobacteria, lateral gene transfer. Mitochondrion and chloroplasts are derived from free-living prok cells (aerobic bacterium). Not derived from same place nuclear envelope is derived.
