Unit 1.2 Transport across membranes

Question 1

What do cell membranes contain?

Answer 1

Phospholipids, Proteins

Question 2

What substances break down the cell membrane?

Answer 2

Alcohol, Acids, heat and Detergent

Question 3

What is diffusion

Answer 3

Diffusion is the movement of molecules from an area of high concentraion to an area of low concentraion.

Question 4

Diffraction is what type of process?

Answer 4

Diffraction is a passive process. This means it does not require energy as it is moving along the concentration gradient/

Question 5

Two types of passive processes

Answer 5

• Diffusion
• Osmosis

Question 6

What is osmosis?

Answer 6

Osmosis is the movement of water molecules from a high water concentration to a low water concentration over a selectively permeable membrane