Biology Revision

Cell theory is a scientific theory which describes the properties of cells

Cell theory states:All organisms are composed of one or more cells

The cell is the basic unit of structure and organisation

All cells come from pre-existing cells

Are microscopic, singled celled organisms

Are cells that do NOT have membrane bound organelles (eg:Nucleus) Example: Bacteria (Escherichia Coli or Streptococcus pneumoniae