Which of the following subunit of ribosome is composed of 23S rRNA and a 5S rRNA along with 32 different proteins?

50S

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70S

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30S

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60S

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40S

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Solution

The correct option is A 50S
Ribosomes are naked ribonucleoprotein particles. Ribosomes of eukaryotes are of 80S type whereas prokaryotes have 70S type of ribosomes.
On the basis of sedimentation coefficient, the larger and smaller subunits of prokaryotic ribosomes are 50S and 30S. The larger subunit has 23S and 5S while smaller subunit has 16S rRNA. Besides rRNA, ribosome has a number of protein molecules.
The larger subunit; 50S subunit has 32 proteins and smaller subunit, i.e., 30S has 21 proteins. The rRNA to protein ratio of 70S ribosomes is 60-65 : 35-40.

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