Question

Which of the following events does NOT occur after the transcription of poly-A-signal sequences into mRNA?...

Which of the following events does NOT occur after the transcription of poly-A-signal sequences into mRNA?

  1. 5’ capping of the mRNA
  2. Cleavage of the mRNA releasing it from RNA polymerase
  3. Additions of many adenine residues to the 3’ end of the mRNA
  4. Termination of transcription
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Homework Answers

Answer #1

Answer is : A.

Explanation:

The 5' capping is the first event which is found on the mRNA. After that polyadenyl polymerase binds to the mRNA. It is found prior to the poly A signal sequence.

The other mode occurs after the poly A signal sequence.:

The poly A tail is synthesised by the process of tailing. In this case, many adenine residue are added at 3' end of mRNA.

The release factor binds to terminator sequence and leads to terminate the transcription.

Cleavage of mRNA releassd from the RNA polymerase.

Then

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