biochem

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Questions and Answers

Which region of DNA determines where RNA polymerase binds to initiate transcription?

  • Enhancers
  • Introns
  • Promoter regions (correct)
  • Exons

What is the function of promoter-proximal elements and enhancers in transcription initiation?

  • To remove introns from the primary transcript
  • To specify the coding region of proteins
  • To affect the rate of transcription initiation (correct)
  • To bind to RNA polymerase

What happens to introns in the primary transcript of eukaryotic genes?

  • They have no coding function (correct)
  • They bind to RNA polymerase
  • They are modified to remove exons
  • They specify the coding region of proteins

Which type of RNA is responsible for forming peptide bonds during protein synthesis?

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

In eukaryotes, what is the function of the 5' cap and poly-A tail on mRNA?

<p>To protect the mRNA from degradation (B)</p> Signup and view all the answers

Which region of the DNA contains the consensus sequence necessary for transcription initiation in prokaryotes?

<p>Pribnow box (D)</p> Signup and view all the answers

What is the function of the sigma factor in prokaryotic transcription?

<p>To recognize the promoter region (C)</p> Signup and view all the answers

Which type of RNA is responsible for carrying the genetic information from DNA to the ribosomes for protein synthesis?

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

What is the major difference between prokaryotic and eukaryotic mRNAs?

<p>Eukaryotic mRNAs have a 5' cap and a poly(A) tail, while prokaryotic mRNAs do not. (A)</p> Signup and view all the answers

Which enzyme is responsible for synthesizing RNA in prokaryotes?

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

Which enzyme synthesizes the precursor of mature rRNA in eukaryotes?

<p>RNA Pol I (A)</p> Signup and view all the answers

Which region of the gene contains binding sites for general transcription factors (GTF) in eukaryotes?

<p>Core promoter region (C)</p> Signup and view all the answers

What is the function of TFIID in eukaryotic gene transcription?

<p>Recognize and bind TATA-box and other core promoter elements (A)</p> Signup and view all the answers

What is the role of enhancers in eukaryotic gene transcription?

<p>Increase rate of transcription initiation by RNA Pol II (D)</p> Signup and view all the answers

Which enzyme is responsible for transcribing genes into a single-stranded RNA?

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

What is the function of the 5'-cap in eukaryotic mRNA?

<p>Stabilizes mRNA for initiation of translation (C)</p> Signup and view all the answers

Which RNA polymerase is responsible for synthesizing tRNA, 5S rRNA, and some snRNA and snoRNA in eukaryotes?

<p>RNA polymerase III (D)</p> Signup and view all the answers

What is the role of small nuclear RNA (snRNA) in eukaryotic mRNA splicing?

<p>Mediates splicing by forming base pairs with consensus sequences at each end of the intron (D)</p> Signup and view all the answers

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