The sedimentation constant of ribosome in prokaryotes is generally 70S. It breaks up into two subunits whose sedimentation constants are

50S and 20S

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40S and 30S

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60S and 10S

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50S and 30S

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Solution

The correct option is D 50S and 30S
Prokaryotes have 70S ribosomes, each consisting of a small subunit (30S) and a large (50S) subunit. Their small subunit has a 16S RNA subunit (consisting of 1540 nucleotides) bound to 21 proteins. The large subunit is composed of a 5S RNA subunit (120 nucleotides), a 23S RNA subunit (2,900 nucleotides) and 31 proteins.

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Prokaryotes have 70S ribosomes. It breaks up into two sub units whose sedimentation constants are:

70

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