Lecture 4 - Passive Movement of Molecules Flashcards
1
Q
What membrane bound proteins aid passive transport?
A
pores, channels, and carriers
2
Q
What is primary active transport dependent on?
A
ATP
3
Q
What is secondary active transport use?
A
secondary active transport uses carries/transporters.
4
Q
What are pores?
A
Pores are small, non-gated channels that allow for the transport of water and small solutes.
5
Q
What modifies the propensity of channel opening?
A
- Membrane potential
- Mechanical stress
- Ligand
- Phosphorylation
6
Q
What is open probability (Po)?
A
The Po is the fraction of time the channel stays open
7
Q
What determines permeability in a molecule with channels?
A
open probability and number of channels
