investigation into the factors that affect diffusion rates in model cells

Question 1

what is used to mimic a cell surface membrane?

Answer 1

dialysis tubing

Question 2

what factors can be investigated using dialysis tubing?

Answer 2

temperature
concentration

how they affect the rate of diffusion

Question 3

what is dialysis tubing?

Answer 3

a partially permeable mimic membrane which has pores which are similar in size to those in a cell surface membrane

Question 4

how is dialysis tubing partially permeable?

Answer 4

the pores prevent large molecules such as starch from passing through
BUT
allows small molecules such as water and glucose to pass through

Question 5

what is the dialysis tube filled with in this investigation?

Answer 5

starch and glucose

Question 6

how can the affect of different concentrations on the rate of diffusion be investigated?

Answer 6

placing the filled dialysis tubes in different solute concentrations of solution

Question 7

how is the rate of osmosis calculated?

Answer 7

the change in the volume or the mass of the dialysis tubing