Diffusion

Question 1

What is diffusion

Answer 1

-The net movement of molecules or ions from an area of high concentration to low concentration until equilibrium is reached
-passive process that relies on kinetic energy

Question 2

What is facilitated diffusion

Answer 2

-Charged ions in polar molecules do not diffuse across plasma membrane is due to hydrophobic fatty acids
-movement of these molecules rely on intrinsic proteins
-Passive
Occurs down a concentration gradient with specific proteins

Question 3

What are the two intrinsic proteins in facilitated diffusion

Answer 3

-channel proteins
-carrier proteins

Question 4

Describe channel proteins

Answer 4

-proteins form Water filled hydrophilic channels across the membrane
-Allow specific water-soluble ions to pass
-selective = Open for a specific ion that binds and causes a confirmational change in shape

Question 5

Scribe carrier proteins

Answer 5

-Specific molecule binds to protein
-What is a change in shape which releases molecule inside
-cotransport = Allows more than one molecule to move