Which of the following best describes the 'cap' modification of eukaryotic mRNA?
a) A modified guanine nucleotide added to the 3' end of the transcript
b) A modified guanine nucleotide added to the 5' end of the transcript
c) A string of adenine nucleotide added to the 5' end of the transcript
d) A string of adenine nucleotide added to the 3' end of the transcript
Ans:- b) A modified guanine nucleotide added to the 5' end of the transcript
Capping and tailing is a part of post transcriptional modification.
hnRNA undergoes two additional process called as capping and tailing.in capping an unusual nucleotide (methyl guanosine triphosphate) is added to 5- end of hnRNA. in tailing adenine is added . it is added to 3-end of hnRNA. process of capping helps in recognition of mRNA by the ribosomes. and protection from RNases.
Capping protect the m rna from RNase.
So all other options are wrong
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