Movement Key Terms

Question 1

What is diffusion?

Answer 1

-passive movement of small, non-polar lipid soluble molecules form HC to LC
-eg. CO2 + O2
-move directly through bilayer

Question 2

What is facilitated diffusion?

Answer 2

-requires a channel protein in the membrane to transport polar molecules, charged + water soluble molecules across membrane

Question 3

What is osmosis?

Answer 3

-diffusion of water from HWP/ low solute conc to LWP/ high solute conc through partially permeable membrane

Question 4

What are channel proteins?

Answer 4

-water filled pores
-allows ions to diffuse through
-gated - to open or close

Question 5

What are carrier proteins?

Answer 5

-can switch between 2 shapes
-binding site of carrier protein to be open on 1 side
-then the second side when carrier switches shape