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Ribosomes

Name : - Ribosomes , protein factories

Properties
  • These are the dot like or granular structure without limiting any membrane.
  • It's diameter 15nm.
  • It is made up of 35% protein and 65% ribonucleic acid (RNA) called ribosomal RNA.
  • Human ribosomes are 80S ('S' for Svedberg's Unit)
  • Each ribosome has two subunits i.e. larger (60S) and smaller (40S)
Types of Ribosomes :
  1. Ribosomes attach to the endoplsamic reticulum called rough endoplasmic reticulum (RER).
  2. Free ribosome - that are distributed in the cytoplasm.
Function of Ribosomes :- 
  • Rough endoplasmic reticulum :- Synthesis of protein such as enzymatic protein, hormonal protein, lysosomal protein and the protein of the cell membrane.
  • Free ribosomes :- are responsible for synthesis of protein in haemoglobin, peroxisome and mitochondria.
Ribosomes
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