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

    What is the charge characteristic of a peptide bond?

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

    At what pH does leucine exist as a cation?

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

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

    <p>6.0 (D)</p> Signup and view all the answers

    What is the pKa of glutamic acid?

    <p>9.67 (A)</p> Signup and view all the answers

    Which amino acid has a pl of 12.03?

    <p>Alanine (D)</p> Signup and view all the answers

    What type of bond links amino acids in peptides?

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

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

    <p>Isoleucine (A)</p> Signup and view all the answers

    Which amino acid is categorized as an aromatic amino acid?

    <p>Tyrosine (B)</p> Signup and view all the answers

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

    <p>Glycine (B)</p> Signup and view all the answers

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

    <p>Serine (C)</p> Signup and view all the answers

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

    <p>Valine (A)</p> Signup and view all the answers

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

    <p>Cystine (C)</p> Signup and view all the answers

    Which property distinguishes proline from other amino acids?

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

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

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

    What property enables amino acids to have optical isomers?

    <p>Presence of asymmetric carbon atom (D)</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 (C)</p> Signup and view all the answers

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

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

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

    <p>Acidic and basic properties (B)</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 (A)</p> Signup and view all the answers

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

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

    How is an amino acid charged at strongly alkaline pH?

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

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