BSCI 105 Chapter Notes - Chapter 6: Scanning Electron Microscope, Nuclear Lamina, Nuclear Membrane
31 Jan 2016
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Chapter 6 a tour of the cell- book has chart of everything. Cell- simplest collection of matter that can be alive. Microscopes are used to see the tiny things in life, like cells and their components, by using magnification (ratio of object"s image size to real size) and resolution (clarity of image) and contrast (accentuates difference parts of sample). Lm- light microscope- visible light passing through specimen then glass, which magnifies specimen specimen. Em- electron microscope- focuses on beam of electrons through. Sem- scanning electron microscope- detailed studies of topography. Tem- transmission electron microscope- study on internal structure of cells. Cell fractionation- useful technique in studying cell structure and function structures speeds. Takes cell apart and separates major organelles and subcellular. Uses centrifuge which spins different organelles to bottom at diff. Prokaryotes (bacteria and archaea) and eukaryotes (protists, fungi, animals, and plants) lets certain things in and out. suspended. All have plasma membrane- selective barrier that binds cell and only.
