membrane transport

Question 1

what is the logo of concentration ?

Answer 1

[ ]

Question 2

what is a consentration gradient ?

Answer 2

consentration of solute over a physical space .

Question 3

what happens when a solute is placed in a solvant ?

Answer 3

the molecules will move from an AREA of hight concentration to an area of low concentration

Question 4

explain in your words what this means : net direction of movement will proceed until there is no more concentration gradient.

Answer 4

It means that there will be a movement in a specific direction that will proceed until their is no difference in concentration anywhere.

Question 5

what is this called :net direction of movement will proceed until there is no more concentration gradient.

Answer 5

diffusion

Question 6

what causes a faster rate of diffusion ? (see image in book page 141)

Answer 6

the greater the magnitude of the concentration gardient the faster the diffusion rate will be .

Question 7

some molecule are able to diffuse across the membrane on their own but others can’t. true or false

Answer 7

true

Question 8

the membrane is therefore said to be

Answer 8

selectively permeable

Question 9

a membranes have a … barriers

Answer 9

hydrophobic

Question 10

what molecule has an EASIER time going throught the hydrophobic layers.

Answer 10

hydrophobic

Question 11

what molecule has an HARDER time going throught the hydrophobic layers.

Answer 11

HYDROPHILIC

Question 12

EASY

Answer 12

-SMALL
-HYDROPHOBIC
ex: CO2 and O2

Question 13

HARD

Answer 13

-LARGE
-HYDROPHILIC

Question 14

charact. diffusing molecule :

Answer 14

-polar or non polar
-molecule small or large

Question 15

what is passive transport ?

Answer 15

when a molecule crosses the membrane without the use of energy.

Question 16

passive transport : molecule maybe transported by:

Answer 16

proteins or may diffuse across on its own

Question 17

passive transport is used for transport when :

Answer 17

molecule is moving down its concentration gardient

Question 18

rate of transport depends on what

Answer 18

concentration gardient magnitude

Question 19

what is active transport

Answer 19

when a molecule crosses the membrane withthe help of on or many proteins that provide energy (ATP)

Question 20

(active transport)Used for transport when(3):

Answer 20

-direction of transport is up the concentration gradient
-when many molecule are crossing simultaneously
-when object is large

Question 21

does the rate of transport depend on the concentration gradient magnitude (Passive transport)

Answer 21

YES IT DOES!!!!

Question 22

3 types of passive transport :

Answer 22

1-simple diffusion
2-facilitated diffusion
3- osmosis

Question 23

what is simple diffusion

Answer 23

molecule is diffused on their own through the lipid bilayer.

Question 24

what is facilitated diffusion

Answer 24

molecule uses a channel or carrier protein to cross

Question 25

what is osmosis

Answer 25

movement of the water across the membrane .work like simple and facilitated diffusion .

Question 26

facilitated diffusion steps :

Answer 26

1-binding of cargo molecule to binding site on carrior protein. 2-carrior protein changes shape 3-release of cargo molecule on other side of membrane 4-carrier returns to original shape

Question 27

types of active transport:

Answer 27

1.Channel or carrior protein pumps 2.endocytosis 3.exocytosis

Question 28

active transport by protein pumps resembles what type of diffusion ?

Answer 28

facilitated except that the carrior or channel protein uses ATP.

Question 29

(protein pump ) what does the ATP do the molecules?

Answer 29

provides the energy required to move the molecules against their concentration gradient.

Question 30

what does endocytosis (in) do ?

Answer 30

move large objects or molecules into the cell at the same time.

Question 31

(endocytosis) move large objects or molecules into the cell at the same time.GIVE 3 EXAMPLES

Answer 31

a) pinocytosis (small drops of liquid) b) phagocytosis(for large particles or whole microorganisms) c) receptor-mediated endocytosis (for large numbers of a specific molecule)

Question 32

what is exocytosis

Answer 32

it is the opposite of endocytosis :large amount of molecules leave the cell.It can be a specific molecules or many different ones

Question 33

exocytosis is used to do what ?

Answer 33

get rid of wastes or to secrete specific substances

Question 34

does the rate of transport depend on the concentration gradient magnitude (Active transport)

Answer 34

no it does not