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6. facilitated diffusion is the movement of molecules from a high concentration to a low concentration
7. O2 travels across membranes via..........
- simple diffusion
- facilitated diffusion (channel)
- facilitated diffusion (carrier)
8. In a concentrated solution, animal cells become......
- cytolysed
- crenated
- plasmolysed
9. In pure water, the water potential inside the cell is...........than the surroundings
10. Which factor is inversely proportional to rate of diffusion?
- membrane thickness
- surface area
- concentration gradient
11. steroid hormones travel across membranes via..........
- simple diffusion
- facilitated diffusion (channel)
- facilitated diffusion (carrier)
12. In pure water, plant cells become.......
13. glucose travels across membranes via..........
- facilitated diffusion (carrier)
- facilitated diffusion (channel)
- simple diffusion
14. active transport is the movement of substances across a cell membrane down a concentration gradient, using ATP and carrier proteins
15. In pure water, eukaryotic cells........
16. proteins with specific regions that combine reversibly with certain solute molecules
17. a lipid/phospholipid with a chain of carbohydrate molecules attached
18. generally, in colder temperatures the fluidity of membranes (A) because the fatty acids (B)
- (A) increases (B) expand
- (A) decreases (B) expand
- (A) decreases (B) compress
- (A) increases (B) compress
19. amino acids travel across membranes via..........
- facilitated diffusion (carrier)
- facilitated diffusion (channel)
- simple diffusion
20. isotonic solution
- a solution where the concentration of solute molecule is greater inside the cell than outside
- a solution where the concentration of solutes is the same inside and outside of the cell
- a solution where the concentration of solute molecule is greater outside the cell than inside
