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Capping and Tailing

In a post-tra...

Question

In a post-transcriptional modification called tailing, residues are added at the of mRNA.

A

adenylate, 5'-end

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B

guanylate, 3'-end

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C

adenylate, 3'-end

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D

guanylate, 5'-end

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Solution

The correct option is C adenylate, 3'-end
After transcription (RNA synthesis from a DNA sequence), the precursor of messenger RNA (mRNA) called heterogenous nuclear RNA (hnRNA) undergoes modifications. One such modification is called tailing. In tailing, adenylate residues $(200 - 300)$ are added at 3'-end without any requirement of template. After modification, this fully processed hnRNA is now termed mRNA. It is then transported out of the nucleus for translation (protein synthesis from mRNA).

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Similar questions

Q. Choose the correct answer from the alternatives given :
Select the correct statements regarding the process of transcription in eukaryotes.
(i) The strand of DNA which takes part in transcription process is called as coding strand.
(ii) The enzyme .RNA polymerase can catalyse polymerisation only in one direction i.e.., 5

\to

3.
(iii) An unusual nucleotide methyl guanosine triphosphate is added to the 5 end of hnRNA during capping.
(iv) During Tailing Process. adenylate residues (200 - 300) are Added at 3 end in a template at independent manner.

Q. Select the correct option with respect to post- transcriptional changes in eukaryotes?

1. 5' end - capping - addition of adenylate residues
2. 3' end - tailing - addition of methyl guanosine triphosphate
3. 3' end- tailing - addition of adenylate residues
4. 5' end- capping - addition of methyl guanosine triphosphate

Q. Post transcriptional modification of mRNA in eukaryotes is called

Q. Give an account of post transcriptional modifications of a eukaryotic mRNA.

Q. Read the following statements and choose the correct option.
1. RNA polymerase associates transiently with ‘Rho’ factor to initiate transcription.
2. In bacteria transcription and translation takes place in the same compartment.
3. RNA polymerase I is responsible for transcription of tRNA.
4. When hnRNA undergoes capping process, adenylate residues are added at 3’ end in a template independent manner.
5. hnRNA is precursor of mRNA

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Transcription

BIOLOGY

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Capping and Tailing

Standard XII Biology

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