CELL THEORY

CONTRIBUTERS TO THE THEORY

• Robert Hooke
• Anton Van Leeuwenhoek
• Matthias Schleiden
• Theodore Schwann
• Rudolf Virchow

WHAT THEY DID

• Hooke discovered small holes in cork, and called them cells
• Leeuwenhoek was the first to describe cells, called animalcules
• Schleiden proposed that all plants are made of cells
• Schwann said that both animals and plants were made of cells and cell products
• Virchow proved that cells come from pre-existing cells

PRINCPLES OF THE THEORY

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

PROKARYOTIC CELLS

• No nucleus or cell membrane
• DNA suspended in cytoplasm
• Prokaryotes are single celled organisms

EUKARYOTIC CELLS

• Have a nucleus and membrane bound organelles
• Nucleus encloses genetic information
• May be multi or singular celled