Topic 2 - Movement into and out of cells

Question 1

Diffusion

Answer 1

The net movement of particles from an area of high concentration to an area of low concentration

Question 2

Concentration gradient

Answer 2

The difference in concentration of molecules between two regions. In cells this can be across a cell membrane.

Question 3

Osmosis

Answer 3

The net movement of water from an area of high water concentration to an area of low water concentration through a semi-permeable membrane

Question 4

Active transport

Answer 4

The movement of particles from an area of low concentration to an area of high concentration using energy (usually in the form of ATP).