Across
- 3. a protein loosely bound to the surface of a membrane or to part of an integral protein and not embedded in the lipid bilayer
- 6. results in the net movement of a substance from high concentration to low concentration
- 11. a transport protein in the plasma membrane of animal cells that actively transports sodium out of the cell and potatssium into the cell
- 12. a transmembrane protein channel that allows a specific ion to diffuse across the membrane down its concentration or electrochemical gradient
- 13. regulation of solute concentrations and water balance by a cell or organism
- 15. a phenonmenon in walled cells in which the cytoplasm shrivels and the plasma membrane pulls away from the cell wall; occurs when the cell loses water to a hypertonic environment
- 16. the difference in electrical charge across a cell's plasma membrane due to the differential distributions of ions. it affects the activity of excitable cells and the transmembrane movement of all charge substances.
- 17. a channel protein in a cellular membrane that specifically facilitates osmosis, the diffusion of free water across the membrane
Down
- 1. the diffusion of a substance across a biological membrane with no expenditure of energy
- 2. a transmembrane protein channel that opens or closes in response to a particular stimulus
- 4. the ability of a solution surrounding a cell to cause that cell to gain or lose water
- 5. an active transport protein in a cell membrane that uses ATP to transport hydrogen ions out of a cell against their concentration gradient, generating a membrane potential in the process
- 7. a transmembrane protein that helps a certain substance or class of closely related substances to cross the membrane
- 8. swollen ot distended, as in plant cells
- 9. the diffusion of free water across a selectively permeable membrane
- 10. limp; lacking firmness.
- 14. solution that causes no net movement of water into or out of the cell