Protein Folding and Modifications
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Questions and Answers

What is the modular architecture of proteins composed of?

  • Discrete regions called domains (correct)
  • Discrete regions called exons
  • Discrete regions called codons
  • Discrete regions called introns

    • What is the relationship between exons and domains in a protein?

  • Different exons code for the different domains in a protein (correct)
  • Different domains code for different exons in a protein
  • Different codons code for the different domains in a protein
  • Different introns code for the different domains in a protein

    • What is the result of exon shuffling in protein evolution?

  • The formation of new codons
  • The formation of new mRNA
  • The evolution of new proteins (correct)
  • The formation of new introns

    • What is the role of domains in a protein?

    <p>To facilitate the structure and function of a protein</p> Signup and view all the answers

    What is the significance of domains in protein evolution?

    <p>Domains can result in the evolution of new proteins</p> Signup and view all the answers

    How do exons contribute to the structure of a protein?

    <p>Exons code for specific regions of the protein</p> Signup and view all the answers

    What is the function of the P site in the ribosome?

    <p>Holding the tRNA that carries the growing polypeptide chain</p> Signup and view all the answers

    What is the role of the A site in the ribosome?

    <p>Holding the tRNA that carries the next amino acid to be added to the chain</p> Signup and view all the answers

    How many binding sites does a ribosome have for tRNA?

    <p>Three</p> Signup and view all the answers

    What is the role of the E site in the ribosome?

    <p>Facilitating the exit of discharged tRNAs</p> Signup and view all the answers

    What is the difference between bacterial and eukaryotic ribosomes?

    <p>Some antibiotic drugs specifically target bacterial ribosomes without harming eukaryotic ribosomes</p> Signup and view all the answers

    What is the function of aminoacyl-tRNA synthetase?

    <p>Charging tRNA molecules with amino acids</p> Signup and view all the answers

    What is the function of enzymes in post-translational modification?

    <p>To cleave polypeptides</p> Signup and view all the answers

    What is the process by which a polypeptide chain forms its three-dimensional shape?

    <p>Protein folding</p> Signup and view all the answers

    Where do free ribosomes typically synthesize proteins that function?

    <p>In the cytosol</p> Signup and view all the answers

    What is the role of a signal peptide in polypeptide synthesis?

    <p>To target polypeptides to the ER</p> Signup and view all the answers

    What is the function of a signal-recognition particle (SRP)?

    <p>To bring the signal peptide to the ER</p> Signup and view all the answers

    Where does polypeptide synthesis always begin?

    <p>In the cytosol</p> Signup and view all the answers

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