Download CELL – basic unit of life

CELL – basic unit of life
Brief History
• Antoine van Leeuwenhoek (1600s)
o Invention of the Microscope
o Observed microorganisms, called them “Animalcules”
• Robert Hooke, 1655
o Introduced the term Cell
o Examined thin slices of cork from the bark of an oak tree
o Observed empty, honeycomb-like boxes (Cell Wall)
o Wrote the book Micrographia
• Robert Brown, 1830
o Identified a darkly staining structure at the center of
every cell (Nucleus)
• Matthias Schleiden, 1838
o All plants are made up of cells
• Theodor Schwann
o Animals are made up of cells
• Rudolf Virchow, 1858
o Cells came from preexisting cells
Prepared by: Mr. Louie B. Dasas STC, QC
CELL THEORY
1.All organisms are composed of one or more cells.
2.The cell is the basic unit structure and function of all
organisms.
3.All cells arise only from preexisting cells
Prepared by: Mr. Louie B. Dasas STC, QC