2. Transport across cell membranes

Question 1

What is the cell membrane made of?

Answer 1

protein and phospholipids

Question 2

phospholipids

Answer 2

fat

Question 3

selectively permable

Answer 3

lets small molecules pass through like oxygen and glucose and stops large molecules like starch from passing through

Question 4

examples of passive transport

Answer 4

osmosis and diffusion

Question 5

does passive transport require energy?

Answer 5

no

Question 6

passive transport

Answer 6

occurs due to different concentrations of substances between the cell and its external enviroment

Question 7

occurs due to different concentrations of substances between the cell and its external enviroment

Answer 7

concentration gradient

Question 8

Diffusion

Answer 8

movement of molecules down a concentration gradient from a high concentration to a low concentration

Question 9

diffusion substance in stomata leaves

Answer 9

carbon dioxide

Question 10

diffusion movement in stomata leaves

Answer 10

from a higher concentration in the air to a lower concentration in the leaf

Question 11

Diffusion substance in the villi

Answer 11

glucose

Question 12

diffusion movement in villi

Answer 12

higher concentration in the villus to a lower concentration in the blood capillaries

Question 13

diffusion substance in the alveolus

Answer 13

oxygen

Question 14

diffusion movement in alveolus

Answer 14

higher concentration in the air sac to a lower concentration in the blood capillaries

Question 15

osmosis

Answer 15

movement of water molecules from a high water concentration to a low water concentration

Question 16

osmosis calculation

Answer 16

% change difference over original x 100

Question 17

plasmolysed

Answer 17

cells loose water

Question 18

`Turgid

Answer 18

full of water, membrane pushes against cell wall

Question 19

effect on plant cells with low water concentration

Answer 19

plasmolysed

Question 20

equal water/solute concentration

Answer 20

normal

Question 21

high water concentration

Answer 21

turgid

Question 22

what prevents plant cells from bursting

Answer 22

cell wall

Question 23

effect of osmosis on animal cells with low water concentration

Answer 23

shrivelled

Question 24

equal water/solute solution

Answer 24

normal

Question 25

high water concentration

Answer 25

burst

Question 26

Active transport

Answer 26

movement of molecules and ions from a low concentration to a high concentration

Question 27

what is the function of membrane proteins

Answer 27

responsible for moving molecules and ions against the concentration gradient

Question 28

Does active transport require energy?

Answer 28

yes