Question

What is true about ribosomes?

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

Answer 1

Answer: (B)

Ribosomes are non-membranous (i.e., without membrane) cell organelles composed of rRNA and protein. These are found in both prokaryotic and eukaryotic cells. In prokaryotes, ribosomes are 70s type, whereas in eukaryotes, they are 80S type.