Biology class 9th(Fundamental unit of life) cell part-04

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     BIOLOGY

                               CLASS - 9

             FUNDAMENTAL UNIT OF LIFE

                                   PART - 4


    # TYPES OF CELL


      Cells are two types :


  • Prokaryotic cell


  • Eukaryotic cell


     # prokaryotic cell :


  • Cells which do not have a well defined nucleus are called prokaryotic cells.


  • The nuclear region in these cells is not bounded by a nuclear membrane. 


  • The membrane bound cytoplasmic organelles ( mitochondria, Golgi apparatus, endoplasmic reticulum etc. ) are also absent in prokaryotic cells.


  • The only organelles present in them are ribosomes.


                                    STRUCTURE OF BACTERIAL CELL


# EUKARYOTIC CELLS :


  • Eukaryotic cells are the cells which have a well defined nucleus.


  • It is surrounded by a nuclear membrane.


  • These cells contain membrane-bound cytoplasmic organelles.


#  Differences between prokaryotic cell and Eukaryotic cell


  • CYTOPLASM


  • The jelly-like, semi-fluid part of the protoplasm which occurs between the plasma membrane and the nuclear envelope is called cytoplasm.


      # Cytoplasm has two parts :


  • Cytosol


  • Cell organelles


     # CYTOSOL 


  • It is the fluid part of the cytoplasm.


  • It is viscous, nearly homogeneous and crystallo colloidal liquid that contains a number of substances such as water, ions, enzymes, vitamins, amino acids, carbohydrates, lipids, proteins etc.


      # Cell organelles


  • It is a submicroscopic structure which is embedded in the cytosol and specialized to perform specific cellular functions. 


   #   MULTIPLE CHOICE QUESTIONS 

                                                  





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