simple and facilitated diffusion

Question 1

what is diffusion

Answer 1

the movement of molecuels going from a high concentration to a low concentration

Question 2

are molecuels polar/ no. is it passive or not? what does it go through

how does simple diffusion occur across a cell membrane

Answer 2

non polar molecuels (very small)
move to a high to low conc grad across a phospholipid bialayer
its a passive process becuase it doesnt reqire energy from ATP

Question 3

are molecuels polar/ no. is it passive or not? what does it go through

how does facillitated diffusion across a cell membrane

Answer 3

polar substences (bigger molecuels)
move doen cocn grad through carrier protiens and channel proteins
its a psssive process so doesnt require energy from atp

Question 4

what substences do they facilitate?

how do channel protiens facilitate diffusion

Answer 4

they facilitate water soluble molecuels
they have hydrostatic pores that fill with water and are gated so they can colse and open to let water into the cell.

Question 5

what substences do they facilitate? thin about the tertiary structure

how do carrier proteins facilitate diffusion

Answer 5

they facilitate larger proteins
the complementary substence attaches to the binding site and then the protien changes shape to the substence can be transported