Biology

2. concentration of a substance from one location to another
4. when a object is small enough to pass through the bilayer
6. water loving
9. provide corridors that allowa a specific molecule of ion to cross the membrane
11. diffusion of water through a selectively permeable membrane
13. a barrier that controls what enters and leaves the cell
15. some can pass across them others can not

1. when a molecule needs energy to pass through the cell membrane
3. when a molecule can make its way across the membrane without the use of energy
5. a protein that transport substances across a cell membrane
7. movement of specific molecules across cell membranes through protein channels
8. movement of materials into out of or within of a cell
10. maintain balance
12. water fearing
14. makes up plasma and organelle membranes