BIOSC 0150 Study Guide - Midterm Guide: Particle Size, Cholesterol, Aquaporin
Document Summary
Fluid mosaic model: general structure of a biological membrane, fluid components can move freely, mosaic many discrete components. Biological membranes: phospholipids, head polar & hydrophilic, tail hydrophobic fatty acid, fatty acid chain length will vary, as will degree of saturation & phosphate groups, membrane fluidity depends on, lipid composition. Cholesterol & long chain saturated fatty acids packed tightly make a less fluid membrane. U(cid:374)satu(cid:396)ated fatty a(cid:272)ids ha(cid:448)e (cid:862)ki(cid:374)ks(cid:863) & a(cid:396)e pa(cid:272)ked less de(cid:374)sely (cid:373)aki(cid:374)g a more fluid membrane: temperature. Membranes contain carbohydrates: they are located on the outer surface and act as a recognition site, glycolipids carbohydrate covalently bonds to a lipid, glycoproteins carbohydrate covalently bonds to protein. Cell adhesion & the cell membrane: adhesion & recognition depend on proteins/carbs on the membrane, after 2 cells bind they enhance, protection, structure, communication, cells arrange themselves according to recognition & adhesion, ex. Sponge cells binding b/w molecules is homotypic (same bonds to same)
