cell membrane and transport stuff

Question 1

what does cell membrane consist of

Answer 1

double layer of lipid molecules, lined up side by side

proteins, with carbohydrate chains attached

Question 2

what does it mean to say that the cell membrane is selectively permeable

Answer 2

some molecules can pass, others cannot

Question 3

all the differences between passive transport and active transport

Answer 3

1. Passive (High to Low)
   Active (Low to High area of concentration)
2. passive without using cells energy, active uses cellular energy

Question 4

what is osmosis

Answer 4

diffusion of water molecules across a selectively permeable membrane

Question 5

what is facilitated diffusion

Answer 5

proteins in cell membrane form channel so the sugars can pass

USE NO CELL ENERGY

Question 6

describe active transport and transport proteins

Answer 6

transport proteins pick up specific molecules, carry them across membrane.

Ex (Calcium, potassium, sodium)

Question 6

all the differences between endocytosis and exocytosis

Answer 6

endocytosis: cell membrane changes shape and engulf particle, cell membrane fuses, pinch off vacuole within cell

exocytosis: vacuole fuse with cell membrane,

cell membrane forms an opening to outside and spills out contents of vacuole.