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Protein Tertiary Structure and Secondary Structures Quiz
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Protein Tertiary Structure and Secondary Structures Quiz

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Questions and Answers

What makes the hydrogen-bonded sequences in β-pleated sheets stronger when they run antiparallel to adjacent elements?

  • N-H and C=O groups can line up as closely, strengthening the H-bonds.
  • The structure becomes more unstable, leading to stronger interactions.
  • Ionic bonds are formed between adjacent elements, increasing the hydrogen bond strength.
  • The geometry is such that N-H and C=O groups can't line up closely, weakening the H-bonds. (correct)
  • Which type of bonds stabilize the tertiary structure of proteins?

  • Hydrophobic bonds between R-groups (correct)
  • Covalent bonds between N-H and C=O groups
  • Van der Waals forces between R-groups
  • Ionic bonds between N-H and C=O groups
  • What is the result of disrupting the four interactions that stabilize a protein's tertiary structure?

  • Increased activity of the protein
  • Enhanced stability of the protein structure
  • Formation of stronger hydrogen bonds
  • Denaturation or unfolding of the protein (correct)
  • What type of interactions play a key role in creating the tertiary structure of proteins?

    <p>Hydrogen bonds</p> Signup and view all the answers

    In the example of hemoglobin provided in the text, how many polypeptide subunits come together to form a complete, functional hemoglobin molecule?

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

    Where is the information to build the polypeptide subunits of hemoglobin found?

    <p>In two different genes</p> Signup and view all the answers

    What defines a protein's primary structure?

    <p>The sequence of amino acids joined by peptide bonds</p> Signup and view all the answers

    Which type of bond in a protein's structure exhibits characteristics of a double bond?

    <p>Peptide bond</p> Signup and view all the answers

    What do the polypeptide chains in a protein's structure lack flexibility due to?

    <p>The rigidity of the single bonds on either side of the peptide bond</p> Signup and view all the answers

    Which structural elements in proteins are formed without involving the R-groups?

    <p>Primary structure</p> Signup and view all the answers

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