Are you an mRNA initiation expert?
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Questions and Answers

In eukaryotic mRNA, where is the start codon located?

  • Immediately before the 3' poly-A tail
  • Anywhere in the mRNA sequence
  • Immediately after the 5' cap
  • At the beginning of the mRNA sequence (correct)

    • What is the function of the initiator tRNA in eukaryotic mRNA translation?

  • To recognize the Kozak sequence
  • To carry the stop codon
  • To carry the amino acid methionine (correct)
  • To carry the start codon

    • What is the role of the ribosome in eukaryotic mRNA translation?

  • To read the stop codon
  • To recognize the Kozak sequence
  • To carry the initiator tRNA
  • To scan for the start codon (correct)

    • How is the initiation complex formed in prokaryotic translation?

    <p>The 30s complex is formed before the 50s subunit binds</p> Signup and view all the answers

    What is the function of the initiator AUG codon in prokaryotic translation?

    <p>To mark the beginning of the mRNA sequence</p> Signup and view all the answers

    Where is the initiator tRNA located in the initiation complex in prokaryotic translation?

    <p>At the P-site</p> Signup and view all the answers

    What is the function of the 70s complex in prokaryotic translation?

    <p>To carry the initiator tRNA</p> Signup and view all the answers

    What happens after the 30s complex is formed in prokaryotic translation?

    <p>The 50s subunit binds to the mRNA</p> Signup and view all the answers

    What is the Kozak sequence in eukaryotic mRNA translation?

    <p>The sequence surrounding the start codon</p> Signup and view all the answers

    What happens to stop codons in eukaryotic mRNA translation?

    <p>They cause premature termination of translation</p> Signup and view all the answers

    In eukaryotic mRNA, where is the start codon located?

    <p>At the beginning of the mRNA sequence</p> Signup and view all the answers

    What is the function of the initiator tRNA in eukaryotic mRNA translation?

    <p>To carry the amino acid methionine</p> Signup and view all the answers

    What is the role of the ribosome in eukaryotic mRNA translation?

    <p>To scan for the start codon</p> Signup and view all the answers

    How is the initiation complex formed in prokaryotic translation?

    <p>The 30s complex is formed before the 50s subunit binds</p> Signup and view all the answers

    What is the function of the initiator AUG codon in prokaryotic translation?

    <p>To carry the amino acid methionine</p> Signup and view all the answers

    Where is the initiator tRNA located in the initiation complex in prokaryotic translation?

    <p>At the P-site</p> Signup and view all the answers

    What is the function of the 70s complex in prokaryotic translation?

    <p>To assemble the ribosome</p> Signup and view all the answers

    What happens after the 30s complex is formed in prokaryotic translation?

    <p>The 50s subunit binds to the mRNA</p> Signup and view all the answers

    What is the Kozak sequence in eukaryotic mRNA translation?

    <p>The sequence surrounding the start codon</p> Signup and view all the answers

    What happens to stop codons in eukaryotic mRNA translation?

    <p>They cause premature termination of translation</p> Signup and view all the answers

    In eukaryotic mRNA, where is the start codon usually located?

    <p>Not necessarily at the beginning of the mRNA</p> Signup and view all the answers

    What is the function of the initiator tRNA in eukaryotic mRNA translation?

    <p>To initiate translation at the start codon</p> Signup and view all the answers

    In prokaryotic initiation, where is the initiator tRNA placed in the ribosome complex?

    <p>At the P-site</p> Signup and view all the answers

    What is the function of the Kozak sequence in eukaryotic mRNA translation?

    <p>To mark the location of the start codon</p> Signup and view all the answers

    What is the size of the prokaryotic initiation complex?

    <p>70s</p> Signup and view all the answers

    Which part of the prokaryotic initiation complex is responsible for binding to the mRNA?

    <p>The 30s subunit</p> Signup and view all the answers

    What is the role of the 50s subunit in prokaryotic initiation?

    <p>To catalyze peptide bond formation</p> Signup and view all the answers

    How does the ribosome locate the start codon in eukaryotic mRNA?

    <p>By scanning from the 5' end of the mRNA</p> Signup and view all the answers

    What happens to the initiator tRNA after it binds to the start codon in eukaryotic initiation?

    <p>It moves to the P-site</p> Signup and view all the answers

    What happens to the ribosomal subunits after translation is complete?

    <p>They dissociate from each other</p> Signup and view all the answers

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