Permeability Of Membrane

Question 1

What molecules can be diffused across the membrane and move between the phospholipid molecules?

Answer 1

-small molecules like oxygen and carbon dioxide

Question 2

What other substance can diffuse across the membrane?

Answer 2

-lipid-soluble substances like vitamin A

Question 3

Is the phospholipid layer hydrophilic or hydrophobic?

Answer 3

-hydrophobic

Question 4

Due to the phospholipid layer being hydrophobic it makes it easier for…

Answer 4

lipid-soluble molecules to move through the cell membrane than water-soluble substances

Question 5

What can’t water-soluble substance do

Answer 5

-diffuse through the phospholipid membrane

Question 6

Because water-soluble molecules can’t diffuse through the p-lipid layer how do they get across?

Answer 6

-pass through the intrinsic protein molecules which form water-filled channels across the membrane

Question 7

With the intrinsic protein molecules the cells surface is what?

Answer 7

-selectively permeable to water and some solutes