Cell Membrane Transport

Question 1

what are the main types of molecules that make up cell membrane?

Answer 1

-phospholipids.
-proteins.

Question 2

define the phrase ‘selectively permeable membrane’

Answer 2

-selectively permeable membrane is used to describe a membrane that contains channel-forming proteins that allow molecules to travel directly across the membrane through their pores.
- the size of the pores created by the channel forming proteins controls the size of the molecules that can travel through it.
- small molecules (water) can move through but large molecules (starch) cannot.