CELL 2

Question 1

what is simple diffusion

Answer 1

molecules move down conc gradient

Question 2

what is not required for simple diffusion (2)

Answer 2

1. transport proteins
2. input of en from
   a. ATP
   b. conc / electrochemical gradient

Question 3

what kind of transport is channel mediated

Answer 3

passive

Question 4

what happens in channel mediated transport (2)

Answer 4

1. channel opens

2. ion moves through channel

Question 5

what kind of transport is carrier mediated transport

Answer 5

passive

Question 6

what happens in carrier mediated transport (3)

Answer 6

1. ligand binds to binding site of carrier on one side of mem
2. carrier re-orient so binding site faces other side of mem
3. ligand released

Question 7

what is active transport

Answer 7

molecules move up conc gradient

Question 8

what does active transport require

Answer 8

1. trasport proteins
2. input of en from
   a. ATP
   b. conc / electrochemical gradient

Question 9

PRINCIPLES OF DIFFUSION what is simple diffusion

Answer 9

passive movement of molecules through intermolecular spaces in mem

Question 10

PRINCIPLES OF DIFFUSION what is simple diffusion not

Answer 10

passive transport of molecules through intermolecular spaces in mem

Question 11

PRINCIPLES OF DIFFUSION what is energy that causes diffusion

Answer 11

energy of normal kinetic motion of matter

Question 12

PRINCIPLES OF DIFFUSION what 2 properties of molecule determines if it can cross mem by simple diffusion

Answer 12

1. solubility in lipid

2. size

Question 13

PRINCIPLES OF DIFFUSION what diffuses more readily

Answer 13

1. non polar molecules

2. smaller molecules

Question 14

PRINCIPLES OF DIFFUSION what diffuses less readily

Answer 14

1. polar molecules

2. larger molecules

Question 15

PRINCIPLES OF DIFFUSION what is PM permeable to

Answer 15

1. non polar + uncharged

2. polar + uncharged + small

Question 16

PRINCIPLES OF DIFFUSION what is PM slightly permeable to

Answer 16

water

Question 17

PRINCIPLES OF DIFFUSION what is the PM impermeable to

Answer 17

1. polar + uncharged + large
2. ions
3. polar + charged

Question 18

PRINCIPLES OF DIFFUSION why is there no limit to simple diffusion

Answer 18

does not involved fixed number of binding sites

Question 19

PRINCIPLES OF DIFFUSION what kind of process is simple diffusion

Answer 19

non-saturable

Question 20

PRINCIPLES OF DIFFUSION what is magnitude of concentration gradient

Answer 20

diff in conc of substance across 2 solutions

Question 21

PRINCIPLES OF DIFFUSION what 4 factors influence rate of simple diffusion

Answer 21

1. magnitude of driving force / magnitude of conc gradient
2. membrane SA
3. membrane permeability

Question 22

PRINCIPLES OF DIFFUSION what is SA directly proportional to

Answer 22

rate of simple diffusion

Question 23

PRINCIPLES OF DIFFUSION what is concentration gradient directly proportional to

Answer 23

rate of simple diffusion

Question 24

PRINCIPLES OF DIFFUSION what does higher permeability translate to

Answer 24

higher rate of simple diffusion

Question 25

PRINCIPLES OF DIFFUSION what 5 properties does mem permeability depend on

Answer 25

1. lipid solubulity of molecule
2. size of moleucle
3. shape of moelcule
4. temp
5. diffusing distance / thickness of mem

Question 26

PRINCIPLES OF DIFFUSION what causes higher permeability

Answer 26

1. more lipid soluble
2. small
3. regular shaped
4. high temp
5. thin

Question 27

PRINCIPLES OF DIFFUSION what causes lower permeability

Answer 27

1. less lipid soluble
2. large
3. irregular shaped
4. low temp
5. thick