2. Diffusion

Question 1

why can non-polar molecules diffuse through cell membrane

Answer 1

soluble in lipids

dissolve in hydrophobic layer

Question 2

facilitated diffusion

carrier protein

Answer 2

move large molecules

1. molecule attaches to carrier protein
2. protein changes shape
3. releases molecule on opposite side

Question 3

facilitated diffusion

channel protein

Answer 3

pores

move charged particles

Question 4

rate of simple diffusion depends on

Answer 4

concentration gradient. higher = faster 
short diffusion pathway (thickness of exchange surface)
surface area (larger = faster)

Question 5

rate of facilitated diffusion depends on

Answer 5

concentration gradient (larger=faster)
number of channel/carrier proteins