BIOL 205 Lecture Notes - Lecture 20: Cell Membrane, Lipid Bilayer, Electron Microscope
17 Nov 2016
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Document Summary
Cell biology: the study of the structure, function, and life cycle of organisms at the molecular and microscopic level. Measurements: 1a = 1 x 10^-10m = 0. 1nm (ie. atoms); seen only by an electron microscope, 1mm (micrometer) = 1 x 10^-6m (ie. mitochondria); seen by a light microscope. Cell theory: the unifying principle of biology that was developed by using light microscopes in the (cid:1005)8(cid:1004)(cid:1004)"s. The theory states that all living things are composed of cells (one or more) and all cells arise from pre-existing cells (e(cid:448)e(cid:374) red (cid:271)lood (cid:272)ells, (cid:449)hi(cid:272)h do(cid:374)"t rese(cid:373)(cid:271)le the pare(cid:374)t (cid:272)ell, is derived from cells) Plasma membrane: the lipid bilayer that encloses all cells. The boundary between living cells and non-living surroundings. Co2 and h2o can diffuse across the membrane because they are non-polar. Polar and charged compounds must be transported through proteins into the cell.
