Question

Which of the following prevents the digestion of mRNA by exonucleases?

• A. methyl-guanosine cap
• B. methylene blue
• C. poly(A) tail
• D. bromophenol blue

Answer 1

Answer:

A. methyl-guanosine cap

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.