Lecture Ten : Nucleus

3 important questions on Lecture Ten : Nucleus

What is the structure of the Nucleus ?

  • Surrounded by nuclear envelope
- Inner membrane lined by nuclear lamina (intermediate filament) to maintain nucleus shape & organise DNA packing
- Outer membrane continuous with rER
  • Nuclear pore complex present on nuclear envelope
  • Nucleolus within nucleus
- Makes ribosomal RNA that later combine with proteins to form ribosomes

What are the functions of the Nucleus ?

  • Holds DNA materials
  • Nucleo-cytoplasmic exchange occurs
  • Behaves as Control centre of the cell

What is the difference between Heterochromatin and Euchromatin ?

HETEROCHROMATIN :
  • More dense
  • Not currently used by cell to read the genes for transcription to mRNA
EUCHROMATIN :
  • Less dense
  • Unwinded such that gene needs to be transcribed is available

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