CB1 Cell Transport

Question 1

What is simple diffusion?

Answer 1

The 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
Eg. Oxygen, water, glucose, amino acids

Question 3

What factors affect the rate of diffusion?

Answer 3

Temperature, concentration gradient and surface area cell of membrane

Question 4

Define osmosis

Answer 4

The movement of water molecules from an area of high water concentration to an area of low 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 a percentage change in mass calculated?

Answer 6

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