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Partially permeable membrane

A membrane which allows some small molecules to pass through it by diffusion but does not allow other molecules through.

Concentration

The amount of a substance (solute) in a solution

Ions

Charge particles formed when an atom loses or gains electrons during the formation of ionic bonds

Quiz

1. Cells

Drag the labels to identify the different parts of the cell.

Quiz 1 Print
Animal cell            

Chromosomes
Nucleus
Food store
Mitochondria
Cell surface membrane
Cytoplasm
 

2. Into and out of cells

Drag the answers into the correct boxes, to summarise how molecules get into and out of cells.

Quiz 2 Print
Process Definition Example
Diffusion    
  Molecules moved from low concentration into high concentration using energy.  
    Absorption of water in the digestive system.
Water moves through a partially permeable membrane from a dilute solution into a concentrated solution.
Carbon dioxide moving out of a cell and into the blood.
Sodium ions becoming concentrated inside a nerve cell

Osmosis
Molecules move from high concentration to low concentration.

Active transport
 

3. Select the correct answer from the multi-choices. When you have answered all 4 questions you may check your answers by clicking the button below.

Quiz 3 Print

1.

What is a mutation?

2.

How does smoking cause lung cancer?

3.

How can mutations cause cancer?

4.

What is chemotherapy?