Protein Macromolecules Structure Quiz
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Questions and Answers

What is the main function of the α carbon in an amino acid?

  • It is responsible for forming the peptide bond.
  • It determines the acidity of the amino acid.
  • It provides the distinctive chemical properties to the amino acid.
  • It serves as the chiral center. (correct)
  • Which part of an amino acid varies among the 20 common amino acids?

  • R group (side chain) (correct)
  • Hydrogen atom
  • Carboxyl group
  • Amino group
  • In the language of protein structure, what do amino acids represent?

  • Syntax rules
  • Words
  • Punctuation marks
  • Alphabets (correct)
  • What is the significance of the α-carbon in an amino acid?

    <p>It is the carbon next to the functional group.</p> Signup and view all the answers

    What makes glycine unique among amino acids?

    <p>It has a second hydrogen atom instead of an R group.</p> Signup and view all the answers

    Which type of amino acids have a distinctive cyclic structure in their R group?

    <p>Non-polar, aliphatic amino acids</p> Signup and view all the answers

    What type of amino acids are relatively nonpolar and can participate in hydrophobic interactions?

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

    Which amino acid groups are significantly more polar than phenylalanine?

    <p>Tyrosine and tryptophan</p> Signup and view all the answers

    Which type of amino acids absorb ultraviolet light to a significant extent?

    <p>Tryptophan and tyrosine</p> Signup and view all the answers

    Which group of amino acids are optically active and can exist as enantiomers?

    <p>L Stereoisomers</p> Signup and view all the answers

    What is the distinguishing feature of essential amino acids compared to non-essential amino acids?

    <p>Requirement from external sources</p> Signup and view all the answers

    In which class do aliphatic amino acids with a nonpolar side chain belong?

    <p>Nonpolar, aliphatic class</p> Signup and view all the answers

    Which type of amino acid R groups can form hydrogen bonds?

    <p>Polar, uncharged R groups</p> Signup and view all the answers

    Which amino acid group has the capability to reduce the structural flexibility of polypeptide regions containing it?

    <p>Secondary amino (imino) group containing amino acids</p> Signup and view all the answers

    What role does the distinctive cyclic structure in the R group play in proline residues?

    <p>Reduces structural flexibility</p> Signup and view all the answers

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