Topic 3 (3.1. Cell theory)

• Robert Hooke


  Thought to be first person to view cells, using the term 'cells' to describe these newly discovered structures
• Matthias Schleiden & Theodor Schwann


  Studied animals and plant cells
• Cell theory


  • All living organisms are made up of one or more cells
  • Cells are the basic functional unit in living organisms
  • New cells are produced from pre-existing cells
• Common features of cells found in all living organisms include a cell surface membrane
• Cell components


  • Cytoplasm
  • Ribosomes, RNA
• Prokaryotic cells


  • Have no internal membranes and smaller ribosomes
• Eukaryotic cells


  • Have several internal membrane-bound organelles and larger ribosomes
• Under a microscope it's possible to see the ultrastructure and different cell types
• Cell ultrastructure

  Refers to the internal structure of the cell
• All living organisms are composed of one or more cells.