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01:119:115 (825)
A L L (20)
Lecture

GENERAL BIOLOGY Notes (Part 6) - 4.0ed the course!

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Department
Biological Sciences
Course
01:119:115
Professor
A L L
Semester
Fall

Description
Membranes 10/05/2013 Composition Mainly lipids and proteins Carbs are also important Phospholipids – amphipathic (both hydrophilic and hydrophobic) Proteins are dispersed Held together by hydrophobic interactions Move a lot Cholesterol is “fluidity buffer” Makes membrane less fluid and harder to solidify Unsaturated hydrocarbon tails prevent packing Functions Integral proteins – penetrate hydrophobic interior of the lipid bilayer Peripheral proteins – loosely bound to surface of membrane Recognition – carbohydrates Glycolipids and glycoproteins Permeability Nonpolar molecules can easily cross membrane Polar molecules do not cross rapidly Transport proteins help polar molecules cross membrane by avoiding contact with lipid bilayer Channel proteins – tunnel through membrane Carrier proteins – hold onto passengers and change step to shuttle them across membrane Aquaporins for passage of water molecules Passive transport Diffusion – movement of particles so that they spread out into the available space Down its concentration gradient No input of energy Osmosis – diffusion of water Tonicity Ability of a surrounding 
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