Amino Acid Classification Quiz
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Amino Acid Classification Quiz

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Questions and Answers

Which amino acid contains two carbon atoms?

  • Alanine
  • Cysteine
  • Serine
  • Glycine (correct)

    • Which of the following is a sulfur-containing amino acid?

  • Proline
  • Isoleucine
  • Threonine
  • Methionine (correct)

    • What classification does the amino acid Tyrosine fall into?

  • Hydroxy Amino Acid (correct)
  • Basic Amino Acid
  • Imino Acid
  • Aliphatic Amino Acid

    • Which of the following amino acids is not branched chain?

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

    Which amino acid is classified as imino?

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

    Which of the following amino acids is classified as non-essential?

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

    What is the biological value of a protein that contains all essential amino acids?

    <p>High biological value</p> Signup and view all the answers

    Which amino acid is purely ketogenic?

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

    Which of the following is not an essential amino acid?

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

    Which amino acid is considered an imino acid?

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

    Which of the following amino acids is classified as aromatic?

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

    What role do non-essential amino acids play in metabolism?

    <p>They can be synthesized from other compounds.</p> Signup and view all the answers

    Which one of the following is classified as a semiessential amino acid for humans?

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

    Which amino acid is an example of a polar amino acid?

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

    Which of the following is classified as a ketogenic amino acid?

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

    What property allows amino acids to behave as both acids and bases?

    <p>Amphoteric property</p> Signup and view all the answers

    Which type of solvent are amino acids generally soluble in?

    <p>Polar solvents</p> Signup and view all the answers

    Amino acids that do not absorb visible light are categorized as what?

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

    Which of the following amino acids is classified as having a polar, uncharged side chain?

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

    Which amino acids are considered basic due to their positively charged side chains?

    <p>Lysine and Histidine</p> Signup and view all the answers

    What characterizes non-polar (hydrophobic) amino acids in terms of their behavior in proteins?

    <p>They are buried in the interior of cytosolic proteins.</p> Signup and view all the answers

    Which of the following amino acids is categorized as an essential amino acid?

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

    What is true about the amino acids with negatively charged side chains?

    <p>They include Glutamic acid and Aspartic acid.</p> Signup and view all the answers

    Which statement accurately describes polar amino acids?

    <p>They can participate in hydrogen bonding with water.</p> Signup and view all the answers

    Which amino acids are classified as semi-essential?

    <p>Arginine and Histidine</p> Signup and view all the answers

    Why are polar amino acids often found on the surface of proteins?

    <p>They can react with water and form hydrogen bonds.</p> Signup and view all the answers

    What occurs at the isoelectric point of amino acids?

    <p>Amino acids exist in a dipolar form with zero net charge.</p> Signup and view all the answers

    Which statement correctly describes zwitter ions?

    <p>They are formed at the isoelectric point.</p> Signup and view all the answers

    At a higher pH, amino acids predominantly carry what kind of charge?

    <p>Negative charge</p> Signup and view all the answers

    What characterizes amino acids in a neutral pH environment?

    <p>They are predominantly dipolar ions.</p> Signup and view all the answers

    What is true for the amino acids in an acidic environment?

    <p>They carry a positive charge.</p> Signup and view all the answers

    Study Notes

    Amino Acid Classification by Carbon Atoms

    • 2 Carbons: Glycine
    • 3 Carbons: Alanine, Serine, Cysteine, Phenylalanine, Tyrosine, Tryptophan, Histidine
    • 4 Carbons: Methionine, Threonine
    • 5 Carbons: Arginine, Valine
    • 6 Carbons: Lysine, Leucine, Isoleucine

    Amino Acid Classification By Structure

    • Imino Acid: Proline
    • Acidic Amino Acids: Glutamic acid and Aspartic acid
    • Basic Amino Acids: Lysine, Arginine, and Histidine
    • Sulfur Containing Amino Acids: Cysteine, Methionine
    • Hydroxy Amino Acids: Serine, Tyrosine, Threonine
    • Aromatic Amino Acids: Phenylalanine, Tyrosine, Tryptophan
    • Heterocyclic Amino Acids: Histidine, Proline, Tryptophan
    • Aliphatic Amino Acids: All other amino acids
    • Branched Chain Amino Acids: Valine, Leucine, Isoleucine
    • Amide Group Containing Amino Acids: Glutamine and Asparagine

    Amino Acid Classification By Polarity

    • Hydrophilic Amino Acids:
      • Basic Side Chain Amino Acids: Lysine, Arginine, Histidine
      • Acidic Side Chain Amino Acids: Glutamic acid, Aspartic acid
      • Polar, Uncharged Side Chain Amino Acids: Serine, Threonine, Tyrosine, Cysteine, Asparagine, Glutamine
    • Hydrophobic Amino Acids: Alanine, Valine, Leucine, Isoleucine, Proline, Phenylalanine, Tryptophan, Methionine, Glycine

    Amino Acid Classification By Nutritional Requirements

    • Essential Amino Acids: Valine, Isoleucine, Leucine, Lysine, Arginine, Methionine, Threonine, Tryptophan, Phenylalanine, Histidine
    • Semi-Essential Amino Acids: Arginine, Histidine
    • Non-Essential Amino Acids: All other amino acids

    Amino Acid Classification By Metabolic Fate

    • Pure Ketogenic: Leucine, Lysine
    • Glucogenic and Ketogenic: Isoleucine, Tyrosine, Phenylalanine, Tryptophan
    • Pure Glucogenic: All other amino acids

    Amino Acid Properties

    • Solubility: Soluble in polar solvents like water and alcohol due to the presence of charged groups, Insoluble in non-polar solvents
    • Color: Colorless (except aromatic amino acids which absorb ultraviolet light at a wavelength of 280nm)
    • Amphoteric Property: Can behave as both an acid (proton donor) and a base (proton acceptor)
    • Isoelectric Point: The specific pH at which the amino acid exists in a dipolar form with zero net charge.

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    Amino Acids Classification PDF

    Description

    Test your knowledge on the classification of amino acids based on various criteria such as carbon atoms, structure, and polarity. This quiz covers essential amino acids, their properties, and their groupings. Perfect for students studying biochemistry or molecular biology.

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