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Which is the 1^st enzyme in capping?(a) Guanyltransferase(b) RNA 5’ triphosphatase(c) N7G methytransferase(d) Guanul transferaseThis question was posed to me in class test.I want to ask this question from Post-Transcriptional Modification topic in chapter Gene Expression : Transcription Prokaryotes of Cytogenetics

Answer»

Correct choice is (d) Guanul transferase

For explanation I would say: 1ST the 5’ triphosphate group is removed by the phosphatase. Then the GPP is added to it making it the G cap. Lastly the methyl transferase TRANSFERS the methyl group to the N7 position of the cap GUANINE.



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