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All organisms are composed of cells

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by

Lalitha Krishnan

on 21 September 2015

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Transcript of All organisms are composed of cells

Mid 1830's

Cells are organisms, all organisms are composed of one or more cells.
(Schleiden & Schwann 1840)


The cell is the basic unit of structure of all organisms.
(Schleiden & Schwann 1840)


All cells are produced by the division of pre-existing cells
(Virchow 1858)





Cell Theory


Cells are organisms, all organisms are composed of one or more cells.
(Schleiden & Schwann 1840)


The cell is the basic unit of structure of all organisms.
(Schleiden & Schwann 1840)



Cell Theory

All cell contains hereditary information(DNA)


All cells are basically the same in chemical composition and metabolic activities.


Energy flow happens with in a cell


Activity of cell depends on the activities of sub-cellular structures within the cell.


Modern Cell theory

German Physiologist
All animal tissue are made up of cells

Theodor Schwann (1839)


A botanist, studied plants under a microscope.
Discovered all plants are made up of cells.

Plants are made up of cells

Maggots appear on rotting meat

Spontaneous generation of life theory

200 year gap??

Antoni Leeuwenhoek 1675
[ Father of Microbiology ]
- Made a simple hand held microscope
- First recorded observation of live cell in “pond scum”

Animacules

Observed a thin slice of cork under the microscope

Called it Cell


1665 Coined the name "Cells"


Omnis cellula e cellula

All cells arise from pre existing cells

Rudolph Virchow (1858)

Antoni Leeuwenhouk
MJ Schleiden
1838

Zacharias Jensson
1590s
Robert Hooke
Compound Microscope
sell more
1830 - Robert Brown discovered Nucleus
1850s - Golgi discovered Golgi apparatus
1903 - Boveri discovered Chromosomes
1938 - Electron microscope invented Ruska
1981 Scanning Tunneling Microscope
Binning & Rohrer
1840-1899 - Mitochondria sighted .. NOT!
MORE ......!!
ER discovered in 1945
Green Fluorescent protein discovered 1995
Full transcript