Wednesday, February 16, 2011

Types of cells


Cell Types
On the basis of structural organization, the cells are divided into two main classes, i.e. prokryotic and Eukaryotic. Prokaryotic (pro-before; Karyon-nucleus) cells are simple in organization, lack certain organelles like Nucleus Mitochondria, Endoplasmic Reticulum and Golgi Complex etc. Prokaryotes like Bacteria and Blue-Green-Algae  are also called Non- nucleated cellss, because they do not have True-Nucleus and chromosomes. Instead their genetic material is present as a single circular Duplex (double-stranded) molecule of DNA, freely nded in a defmite region of cytoplasm called Nucleoid. Prokaryotic cells as they are lout nucleus, divide by direct or Amitotic cell division. Provides a comparative view of generalized plant's, Animal's and Bacterial cells.
Eukaryotic cells (Eu-True, Karyon - Nucleus) are cells that possess true nucleus (chromosomes by nuclear membrane) and membranous organelles like
Mitochondria, Endoplasmic Reticulum and Golgi complex etc. Eukaryotic cells divide to produce daughter cells by Indirect or Mitotic ceIl division. In this chapter we will describe the following Organelles of Eukaryotic celIs.

  1. CELL MEMBRANE 
  2. ENDOPLASMIC RETICULUM 
  3. GOLGI COMPLEX
  4. LYSOSOMES
  5. MICROBODIES 
  6. NUCLEUS
  7. CYTOSKELETON 
  8. CILIA AND FLAGELLA 





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