Chem 111 Exam 4: Protein Building Blocks - Amino Acids
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Questions and Answers

What type of amino acids have ionized carboxyl groups in their side chains?

  • Polar, negatively charged (correct)
  • Hydrophobic
  • Polar, neutral
  • Polar, positively charged
  • Which group of amino acids reacts with water to release a hydroxide anion?

  • Polar, positively charged (correct)
  • Hydrophobic (nonpolar)
  • Polar, negatively charged
  • Polar, neutral
  • In which type of amino acids do all differences depend on their side-chain R groups?

  • Polar, neutral
  • Polar, positively charged
  • Polar, negatively charged
  • Hydrophobic (correct)
  • What is the structural relationship between amino acids in a protein?

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

    Which amino acid terminal is written on the left in the structure of a peptide?

    <p>Amino terminal (N-terminal)</p> Signup and view all the answers

    What kind of reaction forms peptide bonds between amino acids?

    <p>Dehydration reaction</p> Signup and view all the answers

    What does the term 'protonation' refer to in chemistry?

    <p>Addition of a proton</p> Signup and view all the answers

    In the context of pH, what does the pKa value indicate?

    <p>Acidity of a solution</p> Signup and view all the answers

    What determines the isoelectric point (pI) of a molecule?

    <p>Average of pKa values around zwitterion</p> Signup and view all the answers

    Which amino acid has an isoelectric point (pI) defined by the average pKa values if it has more than 2 pKas?

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

    What type of bond is responsible for stabilizing the tertiary structure of proteins?

    <p>Ionic bond</p> Signup and view all the answers

    How are hydrophobic interactions involved in maintaining the tertiary structure of proteins?

    <p>By repelling water molecules</p> Signup and view all the answers

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