BIO 2135 Final: bio2135final
20 Apr 2017
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Document Summary
Multicellular organisms arose from single celled organisms. Endosymbiont theory accounts for: nuclear membrane, intracellular membranes and spaces, mitochondria (chloroplasts): the energy site for the cells. Membrane proliferation of the mitochondria created nuclear envelop and it also divided the cell into cytoplasmic space and non-cytoplasmic space. Originally, bacteria had a nuclear material that was in the nucleoid region, with no separation of the cytoplasm. Cytoplasm had to contain all of material and processes for protein production, digesting and breakdown of material, duplication of dna, translation, transcription, etc. In part of the enfolding inwards of the membrane, it completely surrounded the nucleus material formed plasma membrane. Pores are also formed and the environment was chemically set up for all the things that are involved with dna (replication, translation, transcription) The nuclear plasm specialized for all the processes for dna and left cytoplasm to become the region where all the other cellular activities occurred.
