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

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

  1. A

    Found exclusively in prokaryotes. 

  2. B

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

  3. C

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

  4. D

    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.

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    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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