Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
MCB305 Lecture 2
Cell Membranes
| Question | Answer |
|---|---|
| Phosphatidylcholine | most abundant/common, on both sides of membrane, most cells have |
| Phosphatidylethanolamine | sometimes more asymmetric in other cells |
| Phosphatidylserine | only on inner leaflet, negative charge, asymmetric, signal for apoptosis |
| Apoptosis | membrane flip inside out --> pserine is on outside of cell signalling other cells to destroy it |
| Phosphatidylinositol | rare, used in signal transduction |
| Sphingomyelin | found in lipid raft: strong concentrationof cholesterol, protein, and the lipid; promote signal transduction-not directly |
| Lipid rafts | thicker than rest of layer (sphingo=thicker); proteins tend to accumulate in these rafts; enhance signal transduction |
| Amphipathic | transmembrane proteins are amphipathic-polar (heads) and non polar (tails) regions |
| Movement of proteins | laterally, spin, can't flip flop (top/bottom switch) because of the charges/polarity |
| Symport | the transport of two moelcules in the same direction (coordinated uptake of glucose and Na+) |
| Uniport | transport of only a single molecule (facilitated diffusion of glucose) |
| Antiport | two molecules are transportedi n oppoiste directions (Na+-H+ antiporter regulates intracellular pH by removing excess H+ and preventing acidifcation of the cytoplasm) |
| Carrier proteins (pumps) | bind specific molecules to be transported undergoing conformational changes to allow for release on the opposite side of membrane; work via facilitated diffusion or active with input of ATP |
Created by:
trangn
Popular Biology sets