Paper Chromatography and Rf Values
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Questions and Answers

What is the main purpose of exposing the dipeptide samples to a 6NAHCl solution?

  • To break up the dipeptide into individual amino acids (correct)
  • To facilitate the measurement of Rf values
  • To preserve the amino acids
  • To enhance color development
  • What role does spraying the paper with a 0.5% solution of ninhydrin serve in paper chromatography?

  • To stabilize the amino acids
  • To allow colors to develop (correct)
  • To decrease the Rf value
  • To remove impurities from the paper
  • If sample 1 contains arginine and asparagine, which amino acids are in sample 3?

  • Asparagine and Glutamic acid
  • Arginine and Serine
  • Glutamic acid and Leucine
  • Valine and Serine (correct)
  • How is Rf value calculated in paper chromatography?

    <p>Distance traveled by the sample divided by distance traveled by the solvent front</p> Signup and view all the answers

    Which amino acid pair is associated with sample 2 based on the calculations?

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

    Why are the amino acids identified from the bacterium's dipeptide samples important?

    <p>They facilitate the bacteria's growth in laboratory conditions</p> Signup and view all the answers

    What is a likely outcome if the Bacteria's preferred medium lacks the identified amino acids?

    <p>The bacteria may not survive or reproduce effectively</p> Signup and view all the answers

    Which of the following options correctly identifies the components present in sample 1?

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

    Study Notes

    Paper Chromatography Results

    • Results are illustrated in Figure 2, showcasing the separation of amino acids.
    • Rf (retention factor) values for amino acids must be calculated using a ruler.

    Purpose of Procedures

    • Exposing dipeptide samples to 6NAHCl breaks down dipeptides into individual amino acids.
    • Spraying the chromatography paper with a 0.5% ninhydrin solution allows color development for visualization of amino acids.

    Amino Acid Composition

    • Sample 1 contains Arginine and Asparagine.
    • Sample 2 consists of Glutamic acid and Leucine.
    • Sample 3 has Valine and Serine.

    Bacterial Species Context

    • Each dipeptide sample correlates to essential amino acids for specific bacterial species.
    • The amino acid composition is linked to the growth medium that supports bacterial survival and reproduction.

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    Description

    This quiz covers the results and calculations of paper chromatography, focusing on the determination of Rf values for different amino acids. It emphasizes the practical application of chromatography techniques and analytical skills in a laboratory setting.

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