NEET 2012 Biology question

What is true about ribosomes ?

(1)These are self-splicing introns of some RNAs
(2)The prokaryotic ribosomes are 80S, where "S" stands for sedimentation coefficient
(3)These are composed of ribonucleic acid and proteinsCorrect
(4)These are found only in eukaryotic cells

Answer: (3)

Solution

Ribosomes are ribonucleoprotein particles made of ribosomal RNA (rRNA) and proteins, so (3) is true. (1) is wrong: self-splicing introns are RNA sequences (ribozymes) within genes, not ribosomes. (2) is wrong:

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Question ID VK-091217