Dialysis Membrane Concentration Measurement Quiz
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Questions and Answers

What does a straight-line fit of the data for the average number of A's bound per macromolecule vs. total concentration of A indicate?

  • The macromolecule binds A molecules in a linear manner (correct)
  • The macromolecule binds A molecules in a non-linear fashion
  • The macromolecule binds A molecules with a positive slope
  • The macromolecule does not bind A molecules
  • Why does the experimental data indicate that [A]T,in > [A]T,out in all cases?

  • The macromolecule binds some A molecules (correct)
  • The macromolecule releases A molecules
  • The macromolecule accelerates the dialysis process
  • There was an error in measuring the concentrations
  • What does the Scatchard equation predict about the slope of the straight-line fit of the data?

  • The slope shows the number of macromolecules present
  • The slope represents the y-axis intercept value
  • The slope is equal to -K (correct)
  • The slope is proportional to the total concentration of A
  • In the context of the experiment, what does the term 'A' represent?

    <p>Free A molecules</p> Signup and view all the answers

    How is the average number of A's bound per macromolecule calculated?

    <p>([A]in - [A]out) / [M]</p> Signup and view all the answers

    What can be inferred from the fact that the total concentration of A on the side without the macromolecule is greater than that on the side with the macromolecule?

    <p>The macromolecule binds some A molecules</p> Signup and view all the answers

    What does the quantity [M] represent in the given text?

    <p>Total concentration of macromolecule</p> Signup and view all the answers

    In the context of ligand binding, what does the equilibrium constant K represent?

    <p>Binding constant for the ligand</p> Signup and view all the answers

    What does the quantity $ u$ represent in the ligand binding equation?

    <p>Average number of ligands bound per macromolecule</p> Signup and view all the answers

    If a macromolecule has N equivalent binding sites, what is the average number of sites bound per macromolecule as per the given text?

    <p>$\frac{NK[A]}{1 + K[A]}$</p> Signup and view all the answers

    Which statement best describes the role of Kj in ligand binding at site j?

    <p>Binding constant for the ligand at site j</p> Signup and view all the answers

    What does the equation $K[A]\nu = \sum\nu_j = \sum(1 + K[A]) = NK[A] (1 + K[A])$ represent in the ligand binding context?

    <p>Average number of ligands bound per macromolecule</p> Signup and view all the answers

    What is the assumption that the Scatchard equation depends on?

    <p>Identical and independent binding sites</p> Signup and view all the answers

    Which method is often used to evaluate the degree of cooperativity in a binding process?

    <p>Hill plot</p> Signup and view all the answers

    What is the primary reason more advanced treatments are required if the assumption of identical and independent binding sites is violated?

    <p>To consider the Donnan effect</p> Signup and view all the answers

    What is the condition for electrical neutrality in solutions inside and outside the membrane in the Donnan effect context?

    <p>[Na+]out = [Cl-]out</p> Signup and view all the answers

    In the Donnan effect scenario, what does equation (6) yield when using the relationship from equations (2) and (5)?

    <p>[Cl-]in = c2/[Na+]in</p> Signup and view all the answers

    What is implied by the charge on the macromolecule (zM) in the context of the Donnan effect situation?

    <p>Being independent of the ligands</p> Signup and view all the answers

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