NTA Abhyas NEET2020BotanyCell - The Unit of LifePractice
What is true about ribosomes?
Options
- AThe prokaryotic ribosomes are 80S, where "S" stands for sedimentation differentiation.
- BThese are composed of ribonucleic acid and proteins.
- CThese are found only in eukaryotic cells.
- DThese are self - splicing introns of some RNAs.
Correct answer
B. These are composed of ribonucleic acid and proteins.
Step-by-step solution
Ribosomes are amembraneous (i.e., without membrane) cell organelle composed of rRNA and protein. These are found in both prokaryotic and eukaryotic cells. In prokaryotes, ribosomes are 70S type while in eukaryotes, it is 80S type. Here ‘S’ (Svedberg’s Unit) stands for the sedimentation coefficient.