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Flashcards in lipids Deck (14):
1

define: lipids

-non soluble in polar substances
-soluble in aprotic organic substance

2

categories of lipids?

triglycerides, phospholipids, steroids

3

describe fatty acids

long hydrocarbon chains (unsaturated or not) with COOH. usually even no c's

4

relate lipid structure to props

increased length and increased saturation = higher mp

5

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

6

describe triglycerides

ester formed by condensation of glycerol and 3fa's (forms 3H2O)

7

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.

8

describe detergents

soaps but with So3- group instead of COO- as more water soluble

9

describe phospholipids

(glycerol + f fa's + phosphoric acid)phosphatidic acid esterified with low weight alcohol

10

how do phospholipids aggregate

into plb via hydrophobic effect and electrostatic interactions

11

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!

12

describe steroids

plant/animal molecuels that are tetracyclic structures (2 hexagons 2 pentagons)

13

whats the precursor to all steroids?

cholesterol!!

14

examples of steroids?

androgen estrogen anabolic steroids
bile acids
glucocorticoid hormones
mineral cortocoid hormones