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My project THE CELL gives u a brief description of cell ( UNIT OF LIEF) and its type which r basically a very initial intro of the cell..
The cell is A unit of biological activity, differentially permeable membrane and capable of self-reproduction in a medium free of other living system or it may be defined as “A systematically organized community of molecular population in dynamic interaction. It has a morphological, chemical and physical organization which enable it to assimilate grow and reproduce ..
the cell is The unit of structure and function of living organisms..
Cell and its structure is studies under a branch f biology, called Cytogy..
1. All organisms are composed of one or more cell.
2. cells r the basic living units within organisms, and the chemical reaction of life take place within cells.
3. All cells arise only by division from a preexisting cell..
On the basis of recent research the cell is considered as “Highly organized molecular factory”..
Mr Rober Hook (1665) studied a thin slice of bottle cork and found small compartments in it, like the bee-hive and called them cell . In (1674) A. van Leeuwenhoek studies first living cell ..
Every living organism start its life with a cell . If it continues its life as such , it is called an unicellular e.g.. Yeast, diatoms.. Bacteria..
Cells may be considerd from the view point of their (a) structure (b) activity, and (c) chemical organization .
Knowledge of the interrelationships of all the three approaches is necessary for an understanding of the cell as a whole ..
TYPES OF CELL— there is two type of cells..
1. Prokaryotic cells
1. Prokaryotic cell---
From the structure point of view, the prokaryotic cells r primitive . prokaryotic cells have only a single membrane , the Plasma Membrane .. since they have no other membranes, prokaryotic cells contain no nucleus of fully developed membrane – bound cell organelles ,such as chloroplast ,mitochondria, endoplasmic reticulum. etc..
2. Eukaryotic cell ---
Eukaryotic cells have a definitely organized nucleus with a definite membrane , surroundeding the genetic gentic material and membrane bound cell organelles such as lysosomes, dictyosomes etc..