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Question

What is true about ribosomes?

A
These are found only in eukaryotic cells
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B
These are self -splicing introns of some RNAs.
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C
The prokaryotic ribosomes are 80 S, where 'S' stands for sedimentation coefficient.
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D
There are composed of ribonucleic acid and proteins
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Solution

The correct option is D There are composed of ribonucleic acid and proteins
Ribosomes are non-membranous organelles that are found in both eukaryotic and prokaryotic cells. They comprise of an RNA component as well as a protein component.
"These are found only in eukaryotic cells " is incorrect, since they are found in both prokaryotic as well as eukaryotic cells.
"These are self-splicing introns of some RNAs. " is incorrect, since self-splicing introns are ribozymes.
"The prokaryotic ribosomes are 80 S, where 'S' stands for sedimentation coefficient." is incorrect, since prokaryotic ribosomes are 70S, where S stands for Svedberg unit.

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