| A | B |
|---|
| Water moves both by simple diffusion and | aquaporins |
| Process of osmosis describes | movement of water across membrane away from compartment of low salt concentration to compartment of high salt concentration |
| Water molecules move | sequentially through the pore |
| Most of the transporter proteins indirectly depend on gradients generated by | ATPpowered pumps |
| ATP-Powered Pumps | Utilize energy released from hydrolysis of ATP |
| P-Class ATP-Powered Pump | Ion pump and Pump in either direction |
| Cytosolic concentration Ca++ in resting cells | ~10-7 M |
| Cytosolic concentration Ca++ in contracting cells | ~10-6M |
| V-Class Pumps | Transport H+ and Acidify lumen of organelles |
| Two V-class Pumps domain | V1 cytoplasmic domain and V0 transmembrane domain |
| ABC Transporters | Bacterial permeases, Multi-drug resistance proteins (MDR), Transport proteins, amino acids, toxins, drugs |
| MDR | Multi-drug resistance proteins |
