BIOL150 Chapter Notes -Microtubule, Tight Junction, Heterotroph
3 Nov 2014
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Document Summary
Original cells only had rna in them, had both genetic material and catalytic information, then the rna produced protein molecules last, the cells developed dna structure. Proteins became dominant structural and functional macromolecule of all cells. Dna is a double stranded and more stable than rna and thus evolved as better repository of genetic information tpna could have been the precursor of the first genetic material. Earliest forms of life was probably prokaryotes. Early prokaryotes are heterotrophs first autotrophs performed an oxygenic photosynthesis, used h2s instead of. Atmospheric oxygen began increasing by 2. 5bya, this is due to the cyanobacteria evolving to do oxygenic photosynthesis the evolution of photosynthesis transformed the planet. Central dogma evolution: the evolution of dan would have reduce the rate of chemical and mutational damage to the genetic material. Complex protein network, structural support, locomotion, intracellular anchor, involved in mitosis. Microfilaments: maintain cell shape, made of actin intermediate filaments: more permanent structure, variable composition.
