Tag Archives: Cell nucleus

Cells: Structure & Function

All Living Organisms are Made Up of Units Called Cells

  • Cell theory:
    • All living creatures are made from 1 or more cells
    • All cells are produced from previously existing cells (no spontaneous generation)
  • All cells appear to be descended from the first cell which existed about 4 billion years ago
  • For a species to exist its reproductive cells must be potentially immortal (no aging)
  • Our bodies start from a single cell and contain about 100,000,000,000,000 (10^13) cells at maturity

There Are 2 Basic Types of Cells: Prokaryotic and Eukaryotic