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If you consider a transcribing RNA pol II with a transcript as small as 30 bases, which serine residue in its CTD will be phosphorylated?(a) 2(b) 5(c) 7(d) NoneThis question was addressed to me in class test.I need to ask this question from Transcription in Eukaryotes : RNA Polymerases topic in chapter Gene Expression : Transcription Prokaryotes of Cytogenetics

Answer»

Correct CHOICE is (b) 5

The BEST I can explain: when RNA TRANSCRIPT is only 30 bases long it is still within the initiation RANGE. Then the 2nd SERINE residue is phosphorylared only.



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