Biology 1201A Study Guide - Final Guide: Directional Selection, Chromatin, Disruptive Selection
8 Dec 2012
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Anthony van leeuwenkoek made microscopes, first person to see cells and write down results of what he saw. Magnification is an enlargement of what you"re looking at without changing it. Resolution is how close two little dots can be by still looking like two little dots and not merging together. Advent microscope allowed people to look at cells much closer to see viruses. Transmission electron microscope can see inside the cells (cut cells open) but cells must be dead. Scanning electron microscope looks at surface of things, cells can be alive. Minimum resolution of light microscope is 0. 2 (size of small bacterium) and light microscopes can magnify up to 1000x the size. Cell fractionation is taking cells apart to study their components. Centrifuge: fractionate cells and separate their major organelles (used to figure out interactions, breaks the cell open and sorts through all the components in order to see whats happening)
