What is a Ribosome ?

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Ribosomes are some microscopic granules about 150 to 200 angstroms in diameter

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and found in all living cells either attached to the outer membrane of the Endoplasmic Reticulum or scattered in the cytoplasm

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These are described as protein factories of the cell because they synthesise the protein of the cell.

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Ribosomes were first observed by Palade in 1955 under an electron microscope as dense particles.

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How many types of ribosomes?

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Ribosomes found in prokaryotes and eukaryotes are of different sizes and have different sedimentation rates.

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Therefore ribosomes are of the following two types

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Ribosomes are generally oblate spheroidal measuring 18 nm in bacteria and 20-22 nm in Eukaryotic cells. These occur in 2 categories.

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