Cells history Cells Cells are the basic units

Cell’s history

Cells • Cells are the basic units of living organisms. • The invention of the microscope secured their discovery.

History of the cell • Hooke discovered the cell in 1665. • He first saw them through a compound microscope and named them cells after the rooms in a monastery.

• Leeuwenhoek became the first person to examine living cells in 1674.

History of the cell • The compound light microscope has a series of lenses that magnify an object in steps. • Can see things as small as. 00002 cm

History of the cell • In 1838 Schleiden said all plants are made of cells.

History of the cell • In 1839 Schwann said all animals are made of cells.

History of the cell • In 1855 Virchow said all cells came from preexisting cells.

Cell theory • All organisms are made of cells • The cell is the basic unit of organization of an organism. • All cells come from preexisting cells.

Electron microscopes • In the 1940 s The electron microscope was developed. • These microscopes use electrons that pass over and through an object.

Basic cell units • 2 basic cell types –Eukaryotic –Prokaryotic

Eukaryotic • Organisms that are Eukaryotic have cells that contain internal membrane-bound structures.

Organelles • These membranebound structures are called organelles, similar to organs that make up a body.

Prokaryotic • Prokaryotes are organisms with a cell that lacks internal structure.