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1. Which chemical group is added to specific sites near the 5" end of eukaryotic mRNAs...

1. Which chemical group is added to specific sites near the 5" end of eukaryotic mRNAs besides a cap derived from GTP?

a. acetyl

b. methyl

c.hydroxyl

d. carboxl

e. phosphoryl

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Answer #1

The correct option is B.

mRNA processing involves a step, known as capping. In this step, a methylated guanine base is added to the 5' end of the mRNA. It is joined in the mRNA by a 5'-5' phosphate linkage. First, a phosphate group is removed from the 5' end of mRNA. Next, a guanosine monophosphate (GMP) molecule is added. Finally, the guanine base is methylated by the addition of methyl group.

No other chemical group such as carboxyl, acetyl, hydroxyl and phosphoryl is added to the 5' of the mRNA.

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