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Amino Acid Hydrolysis quiz

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  • What is amino acid hydrolysis?
    Amino acid hydrolysis is the cleavage of peptide bonds in proteins using water, often accelerated by an acid catalyst.
  • What catalyst is commonly used to speed up amino acid hydrolysis?
    An acid catalyst, such as 6 molar hydrochloric acid (HCl), is commonly used to speed up amino acid hydrolysis.
  • What happens to a protein when it is treated with 6 molar hydrochloric acid?
    All peptide bonds in the protein are cleaved, releasing all constituent amino acids as free molecules.
  • What is the role of water in amino acid hydrolysis?
    Water is used to break the peptide bonds during hydrolysis, resulting in free amino acids.
  • What does ninhydrin react with in amino acid analysis?
    Ninhydrin reacts with free amino acids produced from hydrolysis to create a bluish-purple color.
  • How is the number of amino acids quantified after hydrolysis?
    The bluish-purple color produced by ninhydrin is measured using a spectrophotometer to quantify the number of amino acids.
  • Which analytical techniques can be used to determine amino acid composition after hydrolysis?
    High-Performance Liquid Chromatography (HPLC) and mass spectrometry can be used to analyze the amino acid composition.
  • Does hydrolysis with 6 molar HCl preserve the sequence information of a protein?
    No, hydrolysis with 6 molar HCl destroys the sequence information, making it impossible to determine the order of amino acids.
  • What is meant by the 'composition' of a protein in the context of hydrolysis?
    Composition refers to the number and types of amino acids present in the protein, but not their order.
  • What is a peptide bond?
    A peptide bond is a covalent bond linking two amino acid residues in a protein.
  • What is the result of hydrolyzing a dipeptide?
    Hydrolyzing a dipeptide produces two free amino acids.
  • Why is an acid catalyst used in amino acid hydrolysis?
    An acid catalyst is used because hydrolysis is a slow reaction, and acid speeds up the cleavage of peptide bonds.
  • What is the visual indicator that ninhydrin has reacted with amino acids?
    The reaction produces a bluish-purple color.
  • What is lost when a protein is completely hydrolyzed with 6 molar HCl?
    The sequence or order of amino acids in the protein is lost.
  • What is the difference between protein composition and sequence?
    Composition is the types and amounts of amino acids present, while sequence is the specific order of those amino acids from the N-terminal to the C-terminal end.