Fluid Mosaic Model

Question 1

Phospholipid Bilayer

Answer 1

Form a barrier to dissolved substances. The centre of the bilayer is hydrophobic do doesn’t allow water soluble substances (like ions and polar molecules) through it but does allow small,non polar molecules to diffuse through

Question 2

Intrinsic Proteins

Answer 2

Channel Proteins and Carrier Proteins allow large , polar molecules and ions to pass through the membrane

Question 3

Peripheral Proteins

Answer 3

Can act as receptors and allow the cell to detect chemicals released from other cels so that they can respond

Question 4

Glycoproteins

Answer 4

Proteins with carbohydrate attached

Question 5

Glycolipids

Answer 5

Lipids with a carbohydrate attached

Question 6

Cholesterol

Answer 6

A type of lipid which fits between the phospholipids. Restricts the movement of other molecules in the membrane and gives it stability by binding to the tails of phospholipids and causing them to pack together more closely. Reduces their movement and makes the membrane less rigid. Has hydrophobic region so acts as a barrier to polar substances moving through the membrane

Question 7

Heads and Tails

Answer 7

Heads are hydrophilic and tails are hydrophobic

Question 8

Role of Cholesterol

Answer 8

Stabilises the membrane structure and regulate the fluidity

Question 9

Role of Channel and Carrier Proteins

Answer 9

Involved in the transport of substances across the membrane