CB1H Transporting substances

Question 1

What is simple diffusion

Answer 1

The net movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient

Question 2

What molecules enter and leave cells via simple diffusion through the cell membrane

Answer 2

Small molecules e.g oxygen, water, glucose, amino acids

Question 3

What factors affect the rate of diffusion

Answer 3

Temperature
Concentration gradient
Surface area of cell membrane

Question 4

Define osmosis

Answer 4

The net movement of water molecules from an area of high water concentration through a partially permeable membrane

Question 5

What is active transport

Answer 5

The movement of molecules across a cell membrane from an area of low concentration to an area of high concentration, against the concentration gradient, using energy

Question 6

How is percentage change in mass calculated

Answer 6

% change = final mass - initial mass
—————————— x 100
initial mass