CHM361H5 Lecture 23: Lec 23 - Dec 02 (Ch 10 pt.1)
Document Summary
Biological membranes can be anywhere from 15-80% position. The transmembrane proteins can be enzymes or transporters. Cells can adjust the lipid composition of membranes to suit functional needs. Different organisms can have different compositions of lipid membranes. Because lipids are hydrophobic and when put in water it decreases the entropy of the system as more ordered water molecules around (form a cage) When you associate the lipids, you disorder the water molecules and the cage is still there but for some water molecules. Lipids form ordered structures spontaneously in water. Minimize contact between the hydrophobic lipid chains and the aqueous: monolayer milieu, addition of small amounts of a fatty acid to an aqueous solution. Formation of monolayer at the air-water interface: polar head groups contact the water surface, hydrophobic tails contact the air i. i. Sticking up: micelles (not phospholipid but detergent, regular micelle i.
