Cell membrane structure

Question 1

Components of teh plasma membrane

Answer 1

Phospholipids (main component)
Proteins
Chlosterol
Glycolipids
Glycoproteins

Question 2

Target cell

Answer 2

A cell with a receptor,with complementary shape, for the hormone molecule

Question 3

Receptor acts as an ion channel

Mechanism of cell signalling

Answer 3

When a chemical signal attaches to teh receptor, it makes the ion channel open, letting ions into the cell

Question 4

Receptor activates a G-protein

Mechanism of cell signalling

Answer 4

When this happens, the G-protein then activates an enzyme which brings about a response

Question 5

Receptor acts as an enzyme

Mechanism of cell signalling

Answer 5

The receptor is made up of 2 parts.The signal molucule attaches to both parts, connecting them together and forming an active enzyme,which bring about a response

Question 6

What molecules can diffuse through the bilayer

Answer 6

Oxygen-Non-polar so diffuses very quickly
Carbon dioxide-Polar but very small so diffuses quickly
Water-Polar but also very small so diffuses quickly
Lipid soluble molecules

Question 7

Why exchange between the cell and the enviroment is essential

Answer 7

To maintain ion levels
To get rid of waste products eg CO2
Oxgen for respiration