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Question

Write a short note on ribosomes.

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Solution

  • Ribosomes were discovered by Robinson and Brown in plant cells and by Palade in animal cells.
  • Ribosomes are naked ribonucleoprotein protoplasmic particles (RNP) with a length of 200-340 Angstrom and diameter of 170-240 Angstrom which function as the sites for the protein or polypeptide synthesis.
  • Ribosomes are popularly known as protein factories. They are subspherical in the outline. A covering membrane is absent. Each ribosome consists of two unequal subunits, larger dome-shaped, and smaller oblate-ellipsoid.
  • The large subunit has a protuberance, a ridge, and a stalk. The smaller subunit possesses a platform, cleft, head, and base.
  • It is about half the size of the larger subunit.

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