Biological and Metabolic Classification of Amino Acids Quiz
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Questions and Answers

At what pH are amino acids fully protonated?

  • pH = 3
  • pH = 5
  • pH = 7.2
  • pH = 1 (correct)
  • What is the net charge of Lys at pH ≈ 3?

  • 0
  • -1
  • +1 (correct)
  • +2
  • What is the net charge of Asp at pH ≈ 5?

  • 0
  • -1 (correct)
  • +1
  • -2
  • At physiological pH (pH ≈ 7.2), what is the net charge of a non-polar amino acid like Ala?

    <p>0</p> Signup and view all the answers

    What is the net charge of Lys at pH ≈ 10?

    <p>0</p> Signup and view all the answers

    What is the net charge of a protein rich in acidic amino acids (Asp and Glu) at physiological pH?

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

    Which type of amino acids must be provided in the diet or as supplements under severe physical stress, trauma, growth, cancer, or pregnancy?

    <p>Conditionally essential amino acids</p> Signup and view all the answers

    Which amino acids can be converted to both glucose and ketone bodies when metabolized?

    <p>Mixed amino acids</p> Signup and view all the answers

    What is the structure called where the positive and negative charges of an amino acid coexist?

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

    Which type of amino acid is considered essential and must be obtained from the diet?

    <p>Essential amino acids</p> Signup and view all the answers

    How many amino acids are in a tripeptide?

    <p>3</p> Signup and view all the answers

    Which amino acids can be converted to ketone bodies when metabolized?

    <p>Ketogenic amino acids</p> Signup and view all the answers

    What is the main force that stabilizes the primary structure of proteins?

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

    What are the two most common secondary structures found in proteins?

    <p>Alpha helix and beta sheet</p> Signup and view all the answers

    How are the adjacent peptide chains or fragments connected in a beta sheet structure?

    <p>By hydrogen bonds</p> Signup and view all the answers

    Which of the following is NOT a basic amino acid?

    <p>Glutamic acid</p> Signup and view all the answers

    What is the principle behind the technique of electrophoresis?

    <p>Separation of proteins based on their net charge</p> Signup and view all the answers

    What is the role of the quaternary structure in proteins?

    <p>Arranges the multiple subunits of a protein</p> Signup and view all the answers

    What factor can denature proteins by weakening their stabilizing bonds?

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

    Which of the following is NOT mentioned as a factor that can denature proteins?

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

    What is the name of the protein in the human brain that misfolding leads to Alzheimer's disease?

    <p>β-amyloid protein</p> Signup and view all the answers

    What characteristic distinguishes prions in their infectious form from their normal form?

    <p>Protease resistance</p> Signup and view all the answers

    What type of changes occur in the central nervous system (CNS) due to prion-mediated diseases?

    <p>Spongiform changes</p> Signup and view all the answers

    How are prions transmitted to humans through cooked food?

    <p>Resistant to heat</p> Signup and view all the answers

    What is the main role of fibrous proteins according to the text?

    <p>Structural support</p> Signup and view all the answers

    Which type of proteins is mostly insoluble in water as mentioned in the text?

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

    What is the primary role of globular proteins based on the information presented?

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

    Which level of protein structure involves proteins with multiple subunits connected mainly by what type of bonds?

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

    Protein denaturation refers to the loss of what from proteins according to the text?

    <p>3D structure</p> Signup and view all the answers

    Which protein listed is an example of a fibrous protein according to the text?

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

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