BIOL 1090 Lecture Notes - Lecture 13: Osmosis, Cell Membrane, Integral Membrane Protein
8 Nov 2017
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Membrane fluidity is crucial to cell function: membrane fluidity must be maintained. In responses to changes in temperature (not so much mammals)* what the asterix is for: lipid composition of membranes can be changed by: A saturated fat has a fatty acid tail while an unsaturated fat has a carbon-carbon double bond. Biological membranes are dynamic: lipids move easily, laterally, within the leaflet, lipid movement to other leaflet, membrane proteins diffuse within the bilayer: Biochemical modification can dramatically alter protein mobility in the membrane (cid:523)part of (cid:498)signal transduction(cid:499)(cid:524) )f added to a (cid:498)liquid crystal(cid:499) membrane fluidity will decrease. )f added to a (cid:498)crystalline gel(cid:499) membrane fluidity will increase. Cholesterol regulates membrane fluidity: alters packing and flexibility of lipids, thus, it is a moderator keeping the fluidity at the right level. Transport-mediated brings elements with them to the area: simple diffusion, very small molecules, uncharged, down a concentration gradient (thus, the flow id downhill)
