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Lecture 3 - Lecture 3 Prokaryotic cells Archaea o Ancient o...

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Lecture 3 Prokaryotic cells Archaea o Ancient o Extreme conditions Bacteria DNA is not in nucleus No membrane-bound organelles Some have jelly-like coatings, coatings that help them stick to surfaces Eurkaryotic Cells Nucleus and membrane-bound organelles DNA in nucleus Cytoplasm Plasma membrane Plant cells have a cell wall, chloroplasts, and a central vacuole Plasma membrane Defines the cell as a distinct entity Phospholipid bilayer – thus had fluid components Danielli’s unit membrane hypothesis (1940’s) o Electron microscopes showed new things in cells o Danielli put together a model referred to Danielli’s “unit” membrane hypothesis Lipid layer Allows lipid and lipid solubles to move about the membrane Pores = sieve theory Membrane had a charge Ions are either attracted or repelled Different properties include hydrophilic = protein layer, membranes behave in the presence of water
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