Identify the correct statement w.r.t. capping.

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Found exclusively in prokaryotes.

During capping 50 to 250 adenine nucleotides are added at the 3' end.

The presence of a 5' cap decreases the stability of mRNA and influences the removal of introns.

It involves addition of an extra nucleotide at the 5' end of the mRNA and methylation by the addition of a methyl group to the base in the newly added nucleotide.

answer is D.

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Detailed Solution

Almost all eukaryotic pre-mRNAs are modified at their 5' ends by the addition of a structure called a 5' cap. This capping consists of the addition of an extra nucleotide at the 5' end of the mRNA and methylation by the addition of a methyl group (CH3) to the base in the newly added nucleotide and to the 2' –OH group of the sugar of one or more nucleotides at the 5' end.

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