BIOL1110 Module 1: Biomolecules and Metabolism
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Questions and Answers

Which of the following is NOT considered one of the 4 major types of biomolecules?

  • Carbohydrates
  • Proteins (correct)
  • Nucleotides
  • Amino acids
  • Which chemical group can R represent in biomolecules?

  • Amino group
  • Carboxyl group
  • Hydroxyl group
  • Alkyl group (correct)
  • Which category does monosaccharides belong to?

  • Lipids
  • Carbohydrates (correct)
  • Nucleotides
  • Amino acids
  • What is the primary function of nucleotides?

    <p>Information storage</p> Signup and view all the answers

    Which type of biomolecule is made up of polypeptides?

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

    What are the abundant elements in living organisms?

    <p>Carbon, nitrogen, oxygen, hydrogen</p> Signup and view all the answers

    What is the primary reason for grouping the 20 amino acids according to the chemical nature of their side chains?

    <p>To understand the properties of different amino acids in proteins</p> Signup and view all the answers

    Why are L- and D-Enantiomers important in the context of amino acids?

    <p>They indicate the stereochemistry of amino acids</p> Signup and view all the answers

    What is the significance of the Kjeldahl method in protein measurement?

    <p>It provides an indirect estimation of nitrogen content in food items</p> Signup and view all the answers

    Why do different food items have different protein conversion factors for the Kjeldahl method?

    <p>Based on the percentage of different amino acids in proteins</p> Signup and view all the answers

    What is the purpose of using melamine in the context of protein adulteration?

    <p>To fraudulently increase the apparent protein content</p> Signup and view all the answers

    Which ionizable groups are present in free amino acids?

    <p>$NH_2^+$ and $COO^-$ groups</p> Signup and view all the answers

    What is the role of the α-carboxyl group and α-amino group in amino acids?

    <p>They are involved in the ionization properties of amino acids</p> Signup and view all the answers

    "Form II" of an amino acid, at physiological pH, has which charge(s)?

    <p>$NH_2^+$ positive charge and $COO^-$ negative charge</p> Signup and view all the answers

    "K1" and "K2" are dissociation constants for which groups in an amino acid?

    <p>$NH_2^+$ and $COO^-$ groups</p> Signup and view all the answers

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