Cell

                                           Cell

 Cell is the structural and functional unit of all living organisms, which replicate independently  capable of performing life functioning,and building blocks of the multicellular organisms , hence it is also called as fundamental unit of life 

The term cell was first observed and identified by the Robert Hook in 1665
Cells consist of cytoplasm enclosed within a membrane, which contain many biomolecules such as Protein and Nucleic acid.
Organisms can be classified as unicellular (like Amoeba) or multicellular (like plants and animals)
Cells are of two types -

                                      1-  Prokaryotic cell 

                                      2-    Eukaryotic cell 

1-Prokaryotic cell -

                            A prokaryotic cell lacks membrane - bound nucleus, Mitochondria or any other membrane - bound Organelles 

The word prokaryotic derived from the two greak word that
  is -
          Pro       -    primitive
          karyon -    Nucleus

 Prokaryotic cell structure -         

   
                     

                      

    Cell wall -

                Outer covering of most Cells that protects the bacterial cell and give it shape 

    Cell membrane -

                             Surrounds the cell's cytoplasm and regulate the flow of substances in and out of the cell.

    Cytoplasm -

                   A gell like substance composed of mainly water that also contains enzymes, salts, cell components, and various organic molecules. 

    Ribosome -

                    In the prokaryotic cell, 70 s ribosomes are present in the cytoplasm. 

    Nucleoid -

                Area of the cytoplasm that contains the prokaryotes single DNA molecule.

   Flagellum -

                 Long, whip like protrusion that aids cellular locomotion used by both gram positive and gram negative bacteria.

2-Eukaryotic cell -