Cell the basic unit of life
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Transcript of Cell the basic unit of life
Before the first
microscope was invented around 360 years ago,
People were not aware of living world that was not visible to the naked eye.
Discovery of the cell
Robert Hooke in the year 1665 observed thin
slices of cork under a simple
magnifying device he designed.
Discovery of the cell
He observed that the cork
resembled the structure of honey comb
consisting many empty box like cavities - Cells.
A significant observation
In 1831 Robert Brown noticed a
near- circular spot slightly more
opaque than the surrounding
areas.
A significant observation
Robert Brown claimed that this structure was an integral part of
the cell and called nucleus.
The Modern Cell Theory consists of three statements based on large body of scientific research. The orginal work was done by Schleiden, Schwan and Virchow
1. The cell is the fundamental unit of structure and function in living things.
2. All living things are composed of cells.3. Cells come from pre existing cells.
Cell is a functional and Structural Unit of LifeEach cell is a membrane bound body that contain all chemical molecules that help support organisms life.
Cell is composed of various parts.
Cell is made up of 3 basic components
1. Plasma membrane2. Nucleus3. Cytoplasm.
Plasma membrane is the outer most covering of the cell separates it contents from external environment.
Plasma membrane is semi permeable membrane and made up of fats and proteins.
Nucleus is the control centre of the cell and has a double layered covering called nuclear membrane
Nucleus contains genetic material (Chromosomes)Which will have DNA
* Nucleus* Membrane bound organelle* Cytoskeleton* Complex
* No Nucleus* No Membrane bound Organelle* No Cytoskeleton* Simple
. Cytoplasm• DNA• Plasma
Membrane
Eukaryotic Cell Prokaryotic Cell
Cytoplasm is the fluid substance that fill the cell and contain various organelle for various functions.
Cell Organelle is a specialised
membrane bound structure with in a
eukaryotic cell which perform specific task