Protein Structure and Amino Acids Overview Quiz
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Questions and Answers

Which group gives unique characteristics bounded to the α-carbon chain in amino acids?

  • Side group R (correct)
  • Primary amino group
  • Imino group
  • Carboxylic acid group
  • At physiological pH, what charge does the carboxyl group of an amino acid have?

  • Negatively charged (correct)
  • Positively charged
  • Neutral
  • Variable charge
  • What is the isoelectric point of a zwitterionic structure?

  • Variable
  • Neutral (correct)
  • Acidic
  • Basic
  • What is the approximate molecular weight of amino acids?

    <p>~135 daltons</p> Signup and view all the answers

    Which amino acid does NOT have a primary amino group?

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

    In which environment do amino acids dissociate protons to form carboxyl anions?

    <p>Basic environment</p> Signup and view all the answers

    Which type of amino acid contains more atoms of nitrogen?

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

    What is the term used for the free amino group at the beginning of a polypeptide chain?

    <p>N-terminus</p> Signup and view all the answers

    Which amino acid contains a sulfhydryl group that can be oxidized to form a dimer called Cystine?

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

    In proteins, almost all carboxyl and amino groups are combined in which type of linkage?

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

    Which amino acid classification includes those with R groups containing polar hydrophilic groups?

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

    Which type of amino acid R group is an alkyl hydrophobic group that can't form hydrogen bonds?

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

    According to the new UIPAC nomenclature, what has replaced the L- & D- forms for amino acid configuration?

    <p>(S)- &amp; (R)- system</p> Signup and view all the answers

    Which pair of molecules are involved in the transport function of proteins?

    <p>Hemoglobin and lactose permease</p> Signup and view all the answers

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