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What is the role of snoRNA in eukaryotes?

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What is the role of snoRNA in eukaryotes?

(a) Chemical modification

(b) RNA splicing

(c) Act as adaptor RNA

(d) Forms component of the ribosome

The question was asked in an international level competition.

I would like to ask this question from RNA topic in chapter Biomolecules and Catalysis of Life Sciences

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The correct option is (a) Chemical modification

The explanation is: snoRNA takes part in chemical modification like methylation of rRNA and other forms of RNA in eukaryotes. It forms a snoRNP complex with the proteins and guides it to the modification site of RNA.

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