Biology 1201A Lecture : Biology 1201 A Notes.docx

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Robert hooke (1635-1703) first to coin the term cell looking at cork. Electron microscope: compound looking at living things looking through, Transmission electron microscope looking at non-living organisms/cells insid. Scanning electron microscope - viewing surface of things. Cell fractionation: dissembling cells to look at components using a centrifuge to look at the organelles. (higher speed = smaller organelles) The cell: simplest form of matter, lowest hierarchal level, basic unit of life, performs functions that keep us alive. Virus: occur in every organism, highly specific to host, can only reproduce in a cell (not a cell) The nucleus: contains most of the genes, has a double membrane (phospholipid. Is fretted with pores to allow who goes in and out, pores called nuclear lamina, intermediate filaments that maintain the shape. Dna in the form of chromatin appears as a diffuse mass. When the cell divides the chromatin fibers condense into chromosomes. The nucleolus is inside the nucleus carries out protein synthesis.

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