Biochemistry Lecture 4: Proteins Classification
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Questions and Answers

What is the main characteristic of fibrous proteins?

  • Form enzymes
  • Contain prosthetic groups
  • Spherical shape
  • Insoluble in water (correct)
  • Which of the following is an example of a globular protein?

  • Keratin
  • Elastin
  • Hemoglobin (correct)
  • Collagen
  • How are simple proteins classified?

  • Dissolve in water
  • Are insoluble in water
  • Contain prosthetic groups
  • Contain only amino acid residues (correct)
  • Which type of proteins contain heme as a prosthetic group?

    <p>Conjugated proteins</p> Signup and view all the answers

    How are globular proteins different from fibrous proteins?

    <p>Fibrous proteins dissolve in water</p> Signup and view all the answers

    What is the main characteristic of protein molecules according to the text?

    <p>Twisted and folded into a complex three-dimensional structure</p> Signup and view all the answers

    What level of protein structure is described as the sequence of amino acids in the peptide chain?

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

    Which type of protein structure is characterized by hydrogen bonds between the amide and carbonyl groups of amino acids along the chain?

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

    What stabilizes the coiled shape of the alpha helix in protein structure?

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

    Which protein structure is characterized by bending and folding into a specific three-dimensional shape?

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

    What type of interactions stabilize the tertiary structure of a protein?

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

    Which protein structural level involves protein chains lying side by side in a parallel arrangement?

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

    What type of bonds hold together two or more polypeptide chains in a larger protein complex?

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

    What is the specific term used to describe the arrangement of subunits in a larger protein complex?

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

    Which of the following is NOT a denaturing agent for proteins?

    <p>Heme groups</p> Signup and view all the answers

    How does denaturation affect the structure of a protein?

    <p>It causes the structure to become random and disorganized.</p> Signup and view all the answers

    In hemoglobin, what does the heme group in each subunit do?

    <p>Transports oxygen in the blood.</p> Signup and view all the answers

    Which of the following is NOT a substance that can denature proteins?

    <p>Cell membranes</p> Signup and view all the answers

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