Flashcards in lipids Deck (14):
-non soluble in polar substances
-soluble in aprotic organic substance
categories of lipids?
triglycerides, phospholipids, steroids
describe fatty acids
long hydrocarbon chains (unsaturated or not) with COOH. usually even no c's
relate lipid structure to props
increased length and increased saturation = higher mp
describe trans fats
usually double bonds form cis conformation but occasionally trans, also artifically by hydrogenation. reduces oxidative rancidity. but enzymes cant break down so aggregates leading to atherosclerosis
ester formed by condensation of glycerol and 3fa's (forms 3H2O)
how are triglycerides turned into soaps
via saponification. add NaOH -> forms ---COO-Na+ and glycerol
-forms micelles, enabling lipid soluble fats/grease to dissolve in HC chain.
soaps but with So3- group instead of COO- as more water soluble
(glycerol + f fa's + phosphoric acid)phosphatidic acid esterified with low weight alcohol
how do phospholipids aggregate
into plb via hydrophobic effect and electrostatic interactions
descirbe fluid mosaic model
-fa chains are fluid so proteins float freely through them
-there are discrete components embedded in the bilayer. they're separat!
plant/animal molecuels that are tetracyclic structures (2 hexagons 2 pentagons)
whats the precursor to all steroids?