Which of the following statements describes capping of mRNA during transcription

Question

Which of the following statements describes capping of mRNA during transcription?                      

                                3-alphaglutarate is added to mRNA through a 5' linkage to the 5' end

                                3-alphaglutarate is added to mRNA through a 3' linkage to the 3' end

                                7-Methylguanylate is added to mRNA through a 3' linkage to the 3' end

                                7-Methylguanylate is added to mRNA through a 5' linkage to the 5' end

                                3-alphaglutarate is added to mRNA through a 5' linkage to the 5' end

                                3-alphaglutarate is added to mRNA through a 3' linkage to the 3' end

                                7-Methylguanylate is added to mRNA through a 3' linkage to the 3' end

                                7-Methylguanylate is added to mRNA through a 5' linkage to the 5' end

Explanation / Answer

Answer is   7-Methylguanylate is added to mRNA through a 5' linkage to the 5' end

In capping, a cap called 7-methylgluanylate is added to mRNA through 5'linkage to the 5'end. cap is found on   5end of an mRNA molecule, consists of a guanine nucleotide connected to mRNA via an unusual 5 to 5 triphosphate linkage. This guanosine is methylated on the 7 position directly after capping by methyltransferase. Capping is done before the completion of transcription.

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