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Which of the following prevents the digestion of mRNA by exonucleases?(a) methyl-guanosine cap(b) methylene blue(c) poly(A) tail(d) bromophenol blueI have been asked this question in semester exam.My doubt stems from Gene Expression in portion Gene Expression of Cell Biology

Answer» RIGHT CHOICE is (a) methyl-guanosine cap

The best explanation: The methylguanosine cap at the 5’ end of the MRNA PREVENTS its digestion by the exonucleases and also plays an important role in the initiation of TRANSLATION.


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