Proteins, Amino Acids, and Peptides Objectives Quiz
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Questions and Answers

What are the monomer units of proteins?

  • Carbohydrates
  • Amino acids (correct)
  • Fatty acids
  • Nucleotides
  • Which functional groups do amino acids contain?

  • Hydroxyl and ester groups
  • Aldehyde and ketone groups
  • Phosphate and sulfhydryl groups
  • Amino and carboxyl groups (correct)
  • How many standard amino acids are there in nature that repeatedly occur in proteins?

  • 50
  • 5
  • 30
  • 20 (correct)
  • Which end of an amino acid is acidic?

    <p>Carboxyl end</p> Signup and view all the answers

    What type of amino acids are most commonly found in proteins?

    <p>Alpha-L amino acids</p> Signup and view all the answers

    What are the building blocks of proteins?

    <p>Amino acids</p> Signup and view all the answers

    What is the general structure shared by all amino acids?

    <p>Amino group and a carboxyl group bonded to the same carbon atom</p> Signup and view all the answers

    Which property is true for all amino acids?

    <p>Chiral except glycine</p> Signup and view all the answers

    At what pH do amino acids exist in a zwitterionic state?

    <p>Isoelectric point (pI)</p> Signup and view all the answers

    How many amino acids are chiral, excluding glycine?

    <p>All of them</p> Signup and view all the answers

    What classification scheme for amino acids can be based on?

    <p>Properties of their side chains</p> Signup and view all the answers

    What property is shared by all amino acids?

    <p>High melting points</p> Signup and view all the answers

    Which group of amino acids contains non-polar aliphatic side chains?

    <p>Glycine, alanine, leucine</p> Signup and view all the answers

    Which amino acid is considered both basic and aromatic?

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

    Among the following, which amino acid is sulfur-containing?

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

    Which amino acid is classified as an imino acid?

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

    Which group of amino acids contains hydroxyl (-OH) groups?

    <p>Serine, threonine, tyrosine</p> Signup and view all the answers

    'Glutamic and aspartic acids have amide derivatives known as'...?

    <p>Glutamine and asparagine</p> Signup and view all the answers

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