selectively permeable (cell membrane)

Question 1

What structure of the cell is selectively permeable ?

Answer 1

The cell membrane.

Question 2

What does it mean when it says the cell membrane is selectively permeable?

Answer 2

This means that it will only allow the passage of smaller, soluble molecules through the membrane.

Question 3

What can move quickly through the membrane?

Answer 3

small molecules e.g. oxygen,carbon dioxide and water .

Question 4

What relies on the presence of channel forming proteins so they can move through the membrane in a pore?

Answer 4

slightly larger molecules e.g. glucose