Salads

Question 1

What is a semi-permeable membrane?

Answer 1

It only lets some things pass.

Question 2

Give an example of a semi-permeable membrane.

Answer 2

The dialysis tubing is semipermeable because it let iodine in but it didn’t let starch out.

Question 3

How do molecules normally move in a concentration gradient?

Answer 3

They move from high concentration to low concentration

Question 4

What is osmosis?

Answer 4

Diffusion of water from high to low concentration

Question 5

Why do we need facilitated diffusion? (What does it do that regular diffusion can’t?)

Answer 5

We need facilitated diffusion so it can help pass the bigger molecules like glucose pass through. It uses transport proteins.

Question 6

What would happen to the molecules of starch inside the bag if we added a digestive (breaking down) enzyme? Would it change the results?

Answer 6

It would break down the starch molecule making it small enough to pass through the dialysis tubing.

Question 7

Hypotonic

Answer 7

Swell; Because water moves into cell to dilute internal concentration

Question 8

Hypertonic

Answer 8

shrivel; Because water leaves cell trying to dilute external concentration

Question 9

Isotonic

Answer 9

Remain at equilibrium; Because there is an even water movement