Active Transport Flashcards
Why is there no net movement at equilibrium?
Because there is no potential energy difference to produce movement
How do carriers move substances?
- When the ligand binds it causes a conformational change which moves the ligand from one side of the cell membrane to the other.
- It can do this in either direction
The rate of carrier-mediated diffusion is determined by?
The speed of each carrier and the number of carriers
Is Carrier-Mediated diffusion active transport? Why/Why not?
No, this is facilitated diffusion, the energy still comes from the concentration gradient
Co-transporters move _____________ in a ______ ratio
Several substances in a fixed ratio
Symports move substances in ___________ direction(s)
The same
Antiports move substances in ___________ direction(s)
Opposite directions
We can use __________ of one molecule to move another. i.e. ________________
Diffusion
Na-Glucose co-transporter
A pump uses _______ to trigger _________________. which allow movement
A pump to trigger conformational changes
The Na-K-ATPase pumps __ Na+ ___ and __ K+ ___
3 Na Out
2 K In
___________ by using ____ changes the binding affinity in pumps
Phosphorylation
ATP
Chemical gradients produced by a pump can be used to power movement of other substances, what is this called?
Secondary Active Transport
