Membrane Transport Flashcards
How many FA chains do Glycerophopholipids have?
Two
How many FA chains do Sphingolipids have?
one
Which lipids are important in fluidity, strength, thickness, and permeability of membranes?
Cholesterol
What is a ceramide?
A sphingosine with FA
What is a glycosphingolipid?
A ceramide with a sugar
What are lipid rafts formed from?
Cholesterol and sphingomyelin
Do peripheral membrane proteins enter the hydrophobic core of the bilayer?
No
What are three types of Integral Membrane Proteins (IMPs)?
Single pass (Glycophorin), 7TM (Rhodopsin), Aquaporin (water channels)
How many aquaporins proteins make up a water channel?
Four
What are the three types of protein membrane anchors?
Two are anchored to cytosolic face: 1) by Fatty acyl group covalently attached to a Gly and 2) by isoprene group through Cys.
One is anchored on the exterior: GPI (always contains PI, PE, and several sugars). Anchors through Asp
What is a secondary active transport?
A type of co-transport. No ATP required. The flow of one solute down its concentration gradient that couples the transport of another solute against its conc. gradient
What type of membrane transport requires a specific protein?
All but simple diffusion
What type of membrane transport involves solute transport against its gradient?
Active and Cotransport (secondary)
What type of membrane transport requires ATP?
Only active transport
Unlike glucose, how does the transport of sucrose differ?
Glucose travels via symporters, while sucrose travels vial antiporters
