RNA Transcription and Modification Quiz
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Questions and Answers

What is the function of the long C-terminal tail of RNA polymerase II in eukaryotic mRNA processing?

  • Cleaves the pre-mRNA to form mature mRNA.
  • Directly transfers capping and splicing components to the emerging RNA. (correct)
  • Coordinates with ribosomes for translation initiation.
  • Binds to the consensus sequence AAUAAA.

Which protein binds to the hexamer AAUAAA in eukaryotic mRNA processing?

  • RNA polymerase II
  • Poly-A polymerase
  • CPSF (correct)
  • CstF

In eukaryotic mRNA processing, what is the role of the CA sequence?

  • Promotes splicing of exons.
  • Facilitates transcription initiation.
  • Binds to the hexamer AAUAAA.
  • Required for the cleavage step. (correct)

What happens when a mutation leaves a normal splice site without a partner in eukaryotic mRNA processing?

<p>An exon is skipped. (A)</p> Signup and view all the answers

Which process ensures that the 3’ end of the pre-mRNA is appropriately processed by RNA polymerase II?

<p>Polyadenylation (C)</p> Signup and view all the answers

What happens when RNA polymerase II terminates transcription at the end of a gene?

<p>It uses a mechanism to ensure proper processing of the 3’ end of the pre-mRNA. (D)</p> Signup and view all the answers

What is the role of the RNA polymerase tail in RNA splicing?

<p>It binds only a few critical components that act as a nucleation site for the remaining splicing components. (C)</p> Signup and view all the answers

Which enzyme is responsible for adding a modified guanine nucleotide at the 5’ end of a new RNA molecule?

<p>Guanyl transferase (C)</p> Signup and view all the answers

In eukaryotic mRNA processing, what is the function of a methyl transferase enzyme?

<p>Adds a methyl group to the guanosine. (D)</p> Signup and view all the answers

What happens once RNA polymerase II has produced about 25 nucleotides of RNA?

<p>The 5’ end of the new RNA molecule is modified by addition of a ‘cap’. (C)</p> Signup and view all the answers

Which proteins seem to 'hop' from the polymerase tail onto the nascent RNA molecule for processing?

<p>Splicing enzymes (D)</p> Signup and view all the answers

What can RNA polymerase II in elongation mode be viewed as?

<p>An RNA factory that transcribes DNA into RNA and processes the RNA it produces (B)</p> Signup and view all the answers

What modifications are made to the ends of eukaryotic mRNA?

<p>Capping on the 5' end and polyadenylation of the 3' end (D)</p> Signup and view all the answers

What is responsible for removing intron sequences from eukaryotic RNA transcripts?

<p>RNA splicing (B)</p> Signup and view all the answers

What is added to the RNA before transcription is completed?

<p>RNA cap (C)</p> Signup and view all the answers

What type of sequences are present in eukaryotic mRNA resulting from transcription?

<p>Coding (exon) and noncoding (intron) sequences (B)</p> Signup and view all the answers

What is depicted as occurring concurrently in the RNA processing steps?

<p>The addition of the RNA cap and RNA splicing (D)</p> Signup and view all the answers

Which enzyme is responsible for adding the RNA cap to eukaryotic mRNA?

<p>Poly-A polymerase (C)</p> Signup and view all the answers

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