Biology Cell Transport

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

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 a cell membrane

Question 4

What is osmosis?

Answer 4

The net movement of water molecules from an area of high water concentration to an area of low water concentration through a partially permeable membrane to have equilibrium.

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

What is the concentration gradient?

Answer 6

A concentration gradient exists when there is a region of high concentration leading to a region of low concentration: going from high to low concentration is going down the concentration gradient