Which of the following means of post-transcriptional -160-control in eukaryotes is not true-The capping of the - 5- end with a modified guanosine triphosphateThe addition of a poly-A tail to the - 3- endThe attachment of signal sequences for direction to specific destinationsThe ligation of exons by DNA polymeraseBoth C and D

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Standard XII

Biology

Central Dogma

Which of the ...

Question

Which of the following means of post-transcriptional control in eukaryotes is not true?

The capping of the

5^{'}

end with a modified guanosine triphosphate

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The addition of a poly-A tail to the

3^{'}

end

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The attachment of signal sequences for direction to specific destinations

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The ligation of exons by DNA polymerase

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Both C and D

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Solution

The correct option is E Both C and D
Capping of eukaryotic mRNAs refers to the addition of 7-Methylguanosine to the 5’ end of almost all eukaryotic mRNAs in an unusual 5’,5’- triphosphate linkage. Tailing refers to cleavage of 3’ end and the addition of 80 to 250 A residues to create a poly(A) tail. Splicing is the removal of introns from the primary transcript and ligation of exons to form a continuous sequence specifying a functional polypeptide. The ligated exons are joined together by DNA ligase. The signal sequence is associated with protein targeting. Thus, the correct answer is option E.

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Similar questions

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. The nascent RNA has
(a) Exons
(b) Introns
(c) 5’ methyl guanosine triphosphate
(d) 3’ poly(A) tail
(e) Two phosphoanhydride bonds

Choose the correct option

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.

The paragraph below gives a description about transcription. Which is the correct description among them? (a) Enzyme involved in transcription is RNA polymerase-II, which consists of 5 polypeptides α, β, β’, σ and ω. Core enzyme recognizes promoter site while σ factor takes part in chain elongation. (b). Initiation starts with help of core enzymes of RNA polymerase enzyme. (c) Elongation is done by σ factor, which moves along the sense strand. (d) In prokaryotes, termination is done by rho factor while in eukaryotes; poly A tail is responsible for termination at 3’.

Q. In post-transcriptional modification, 5’ capping and 3’ polyadenylation is important for
(A) Protection of mRNA
(B) Transport of mRNA from the nucleus to the cytoplasm
(C) Increase the stability of mRNA
(D) Decrease the half-life in order to control the gene expression

Choose the correct option

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