BSC 300 Lecture Notes - Lecture 8: Fluid Mosaic Model, Lipid Bilayer, Polyethylene Glycol
14 Sep 2016
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Document Summary
Elucidate the chemical components of properties of cell. Explain the role of carbohydrates in membrane structure. Describe the types of proteins found in membranes and their roles. Stress the importance of membrane fluidity in living cells. Plasma membrane: the outer boundary of the cell that separates it from the world is a thin, fragile structure about 5-10 nm thick. All membranes (plasma, nuclear, organelle or vesicle) from plants, animals or microorganisms have the same basic ultrastructure. Controls movement of substances in and out of cell. Intracellular interaction: membranes mediate recognition and interaction between adjacent cells: energy transduction: membranes transduce photosynthetic energy, convert chemical energy to atp, and store energy. 1890s: ernst overton provided evidence that membranes are composed of lipids. 1925: gorter and grendel hypothesized that the membrane is a lipid bilayer and that the polar head groups face outward to interact with the aqueous environment. The cell membrane is a lipid bilayer with associated proteins.
