STRUCTURE OF NUCLEUS

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                          NUCLEUS

                                             

                   
                   STRUCTURE OF NUCLEUS
  • Nucleus​ is a membrane bound structure that contains the cell’s hereditary information and controls the cell’s growth and reproduction.
  • Nucleus is present in all eukaryotic cells, they may be absent in few cells like the mammalian RBCs.
  • The shape of the nucleus is mostly round, it may be oval, disc shaped depending on the type of cell.
  • It is the command center of a eukaryotic cell and is commonly the most prominent organelle in a cell.
  • Nucleoplasm is the fluid part of nucleus . Nucleolus and chromatin reticulum are seen here .
  • Nucleolus are spherical bodies, plays a major role in the synthesis of ribosomes .
  • Chromatin reticulum are seen as a network in the nucleoplasm . they carry genes .
  • The nuclear envelope is a double membrane that separates the nucleus from the cytoplasm.
  • The nuclear envelope is perforated with numerous pores called nuclear pores.
  • The envelope helps to maintain the shape of the nucleus and assists in regulating the flow of molecules into and out of the nucleus through nuclear pores.

                Functions of Nucleus

  1. It controls the heredity characteristics of an organism.
  2. It main cellular metabolism through controlling synthesis of particular enzymes.
  3. It is responsible for protein synthesis, cell division, growth and differentiation.
  4. Stores heredity material in the form of deoxy-ribonucleic acid (DNA) strands. Also stores proteins and ribonucleic acid (RNA) in the nucleolus.
  5. It is a site for transcription process in which messenger RNA (mRNA) are produced for protein synthesis.
  6. It helps in exchange of DNA and RNA (heredity materials) between the nucleus and the rest of the cell.
  7. Nucleolus produces ribosomes and are known as protein factories.
  8. It also regulates the integrity of genes and gene expression.








SOURCES
https://www.youtube.com/watch?v=nRNutIWha3c

https://www.youtube.com/watch?v=sL7bE_PA_SE

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