Term 1- Lec 6- Membrane Transport Flashcards
What type of molecules pass the cell membrane via simple diffusion?
Small, non-polar (hydrophobic) molecules
What are the two types of membrane proteins that mediate transport?
Channel and Carrier proteins
Another name for Passive Diffusion
Facilitated Diffusion
Passive transport
Does not require energy and the molecules move down their concentration/electrochemical gradients
Direction of molecules in Active Transport
Against their respective gradients
T/F: Uncharged molecule transport is determined by their concentraion and electrochemical gradients
FALSE; Uncharged molecules do not have a charge therefore an uneffected by electrochemical gradients.
The types of active transport and their differences
- 1º active transport: Uses ATP as it’s E source
* 2º active transport: Uses E from an electrochemical gradient.
T/F: Channel proteins bind to thier solutes
False; their solutes pass through them as long as their open.
Acetylcholine-gated ion channels
Located in muscle cells, when acetylcholin binds to the channel, the gate opens and Na+ enters the cell
Uniport Carriers
A single molecule moves
Symport Carriers
Simultaneous transport of 2 different molecules. A form of Coupled Transport
Antiport Carriers
Transport of two different molecules in opposite directions. aka “Exchangers”. A form of Coupled Transport
The GLUT protein family proteins are what type of __-port carrier
They are all Uniporters
The GLUT protein family proteins exhibit what kind of transport
Passive Transport—Carrier Proteins
Low Km = what affinity
High affinity
