Questions about the cell membrane

I have to write a essay on the cell membrane, but first going to make lists/points on what i am going to talk about.
Q1: Describe the structure of the cell membrane
Q2: Discuss the role of the membrane in both the active and passive movement of molecules.

I don't need alot of details, just points on what to talk about.
Like for the first one i only have 'extremely thin, about 8nm, made up of lipids, proteins and carbohydrates.' But i need more.

Thanks in advance :)

the cell membrane is made of two lipid layers (phospholipid bilayer) that has hydrophilic heads and hydrophobic tails, with proteins embedded within the lipid bilayer to help with transportation. there are cholesterol molecules as well to stabilize the membrane structure.

the membrane is semi-permeable and allows osmosis (movement of water), and allows small uncharged particles to move through (passive transport). other particles are either moved through the protein passively which is called facilitated diffusion, or actively. another way of active transport is by endocytosis (phagocytosis, pinocytosis) or exocytosis.

cell membranes play a role in signalling by the help of receptor proteins

hope that helps :)

Hello...

The Structure Of Protiens: And Introduction To The Cell Membrane

Year 12 Assessment task
Insulin, cell membranes, transport across membranes and protein structure

Before one can fully get to grips with the cell membrane, one has to delve deep into the very complex structure of its basic component - the phospholipid. A normal lipid is comprised of three fatty acid tails, attached to a glycerol head. However, in a phospholipid, one of the fatty acid tails is replaced by a phosphate group. Therefore there are only two fatty acids, with a negatively charged phosphate group replacing the third fatty acid.
As the phospholipid is a polar molecule, with one end being slightly positive, and the other negative, it is attracted to other polar molecules. For example, the phosphate head is attracted to hydrogen ions in water, resulting in the head being hydrophilic. The fatty acid tails however, are hydrophobic, being insoluble in water. This results in the chain changing shape when it is placed with water, forming either a monolayer sitting on the surface...