Unit 5 Flashcards
Given the total number of carbons, draw the structure of a straight-chain fatty acid (16 C)
- You always have to make sure to draw the carboxylic acid (deprotonated) first
- If you need you can also draw out the chemical formula (remember, one will be a CH3 group while the other will be included in the carboxylic acid so subtract two from your CH2s)
*Draw
Given the total number of carbons, draw the structure of a straight-chain fatty acid (14 C)
*Draw
Given the total number of carbons, draw the structure of a straight-chain fatty acid (18 C)
*Draw
Representing the structure of a fatty acid as shown below, draw the structure of diacylglycerol 3-phosphate)
*Draw
diacylglycerol 3-phosphate is the same as phosphatidate
What kind of linkage joins the fatty acid to the glycerol part of the molecule?
Ester linkage
What kind of linkage joins the phosphate to the glycerol part of the molecule?
A phosphodiester linkage
Draw structure of phosphatidic acid
- H
Draw structure for phosphatidylethanolamine
-NH3
Draw structure for phosphatidylcholine
N(Ch3)3
Draw structure for phosphatidylserine
- Nh3 (carboxylic acid no H) (and separate H)
Draw structure for phosphatidylglycerol
- Glycerol upside down with OH instead of O
Draw structure for phosphatidylinositol-4,5-bisphosphate
Draw structure for Cardiolipin
Give a general description of the structure of cholesterol
Has a polar hydroxyl head group ,and a nonpolar steroid nucleus, and a nonpolar alykl side chain
It’s amphipathic
Is cholesterol present in eukaryotic or prokaryotic membranes?
Eukaryotes have cholesterol, prokaryotes do not
Identify the eukaryotic membrane in which cholesterol is the most prominent
Plasma membrane
Micelle
- Individual units are wedge-shaped (cross-section of head is greater than that of side chain)
Spherical structures that contain amphipathic molecules, which are arranged with hydrophobic regions in the core’s hydrophilic head so it contacts water. There is no water in the interior
Lipid bilayer
- Individual units are cylindrically shaped (cross section of head equals that of side chain)
Two lipid monolayers that forms a 2D sheet. Hydrophobic on the inside while hydrophilic on the outside
Vesicle
- Folded, closed bilayer that forms a 3D hollow sphere liposome, enclosing an aqueous cavity (the vesicle lumen). Hydrophobic on the inside, hydrophilic on teh outside
- In a 2D monolayer, the hydrophobic regions at the end are unstable since they are exposed to water, so the bilayer will fold back on itself to form a hollow sphere.
What is the major driving force for the formation of micelles, lipid bilayers, and vesicles?
The hydrophobic effect