CELL THEORY

MAJOR PRINCIPLES OF THE CELL THEORY

• All organisms are made of cells
• All existing cells are produced by other living cells
• The cell is the most basic unit of life

CONTRIBUTORS TO CELL THEORY

• Hooke: the first to identify cells and he named them
• Leeuwenhoek: made better lenses for the microscope, and observed cells in greater detail
• Schleiden: the first to note that plants are made of cells
• Schwann: concluded that all living things are made of cells
• Virchow: proposed that all cells come from other cells

PROKARYOTIC CELLS

• Do not have a nucleus
• Do not have membrane-bound organelles
• The cells DNA is suspended in the cytoplasm
• All prokaryotic cells are microscopic single-celled organisms

EUKARYOTIC CELLS

• Has a nucleus
• Has membrane-bound organelles
• The nucleus encloses the genetic information
• Eukaryotes can be multi-cellular or single celled organisms

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