Biochemistry Lecture 3: Amino Acids Name, Symbol, Structural Formula, pK
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Questions and Answers

What type of bond is formed between amino acids to create peptides?

  • Peptide bond (correct)
  • Hydrogen bond
  • Ionic bond
  • Van der Waals bond
  • What is the result of the formation of a peptide bond?

  • Release of water (correct)
  • Release of oxygen
  • Release of carbon dioxide
  • Release of ammonia
  • Which term best describes the characteristics of a peptide bond?

  • Rigid and planar (correct)
  • Flexible and twisted
  • Curved and linear
  • Elongated and branched
  • In the dipeptide valylalanine, what type of configuration does the peptide bond have?

    <p>Trans configuration</p> Signup and view all the answers

    What is the charge characteristic of a peptide bond?

    <p>Uncharged but polar</p> Signup and view all the answers

    At what pH does leucine exist as a cation?

    <p>Above 6</p> Signup and view all the answers

    What is the isoelectric pH of leucine when it exists as a zwitterion?

    <p>6.0</p> Signup and view all the answers

    What is the pKa of glutamic acid?

    <p>9.67</p> Signup and view all the answers

    Which amino acid has a pl of 12.03?

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

    What type of bond links amino acids in peptides?

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

    Which amino acid has the highest pK₂ value among those mentioned?

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

    Which amino acid is categorized as an aromatic amino acid?

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

    Between Alanine and Glycine, which amino acid has a higher pK₁ value?

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

    Which amino acid has the lowest pK value among those mentioned?

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

    Among Alanine, Valine, and Isoleucine, which one has the closest pK values to each other?

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

    Which amino acid is formed by the condensation of two molecules of cysteine?

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

    Which property distinguishes proline from other amino acids?

    <p>Having an imino group (=NH)</p> Signup and view all the answers

    What is the distinguishing characteristic of proline as an amino acid?

    <p>Being an a-imino acid</p> Signup and view all the answers

    What property enables amino acids to have optical isomers?

    <p>Presence of asymmetric carbon atom</p> Signup and view all the answers

    What is the common solubility characteristic of most amino acids?

    <p>Usually soluble in water and insoluble in organic solvents</p> Signup and view all the answers

    Which amino acid property often results in melting points above 200°C?

    <p>Presence of pyrrolidine ring</p> Signup and view all the answers

    What dual characteristic do amino acids possess that make them ampholytes?

    <p>Acidic and basic properties</p> Signup and view all the answers

    What term is used to describe amino acids due to their ability to donate or accept a proton?

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

    At strongly acidic pH, how is an amino acid charged?

    <p>Positively (cation)</p> Signup and view all the answers

    What is the isoelectric point (pl) of an amino acid?

    <p>The pH at which it carries both positive and negative charges</p> Signup and view all the answers

    How is an amino acid charged at strongly alkaline pH?

    <p>Negatively (anion)</p> Signup and view all the answers

    How can the isoelectric point (pl) of an amino acid be calculated?

    <p>By taking the average pKa values corresponding to the ionizable groups</p> Signup and view all the answers

    What is the term used for a molecule that exists as a hybrid molecule containing positive and negative ionic groups?

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

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