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Which of the following best describes the 'cap' modification of eukaryotic mRNA? a) A modified guanine...

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

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Answer #1

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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