2. Write a short note on ribosome.
Answers
Answer:
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.
Answer:
A ribosome is a large complex of RNA and protein. It does RNA translation, building proteins from amino acids using messenger RNA as a template. Ribosomes are found in all living cells, prokaryotes as well as eukaryotes. A ribosome is a mixture of protein and RNA that starts its formation in the nucleolus of a cell