What is true about ribosomes?

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These are found only in eukaryotic cells.

These are self-splicing introns of some RNAs.

The prokaryotic ribosomes are the 80S, where ‘S’ stands for sedimentation coefficient.

These are composed of ribonucleic acid and proteins.

answer is D.

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Detailed Solution

Concept:Both prokaryotic and eukaryotic cells have ribosomes. 80S ribosomes are found in eukaryotic cells while 70S ribosomes are found in prokaryotic cells.
The ribosome is a complex molecule made of proteins and ribosomal RNA molecules that functions as a factory for the production of proteins inside of cells. The ribosomes were first identified by George E. Palade as tiny cytoplasmic particles connected to the endoplasmic reticulum membrane in 1955. Ribosomal RNAs and ribosomal protein make up the ribosome. Therefore, the right response is that these are made of proteins and ribonucleic acid.
Hence, the correct answer is option 4.

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