Temperature Adaptation in Biological Systems
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Questions and Answers

What is the effect of increasing substrate concentration on the rate of an enzyme-catalyzed reaction at low substrate concentrations?

  • The rate of reaction reaches a maximum value
  • The rate of reaction decreases
  • The rate of reaction increases linearly (correct)
  • The rate of reaction remains unchanged

    • What is the Michaelis-Menten equation for the rate of an enzyme-catalyzed reaction?

  • v = km / [S]
  • v = vmax - km [S]
  • v = vmax [S]/(km + [S]) (correct)
  • v = km [S]

    • What is the effect of increasing substrate concentration on the rate of an enzyme-catalyzed reaction at high substrate concentrations?

  • The rate of reaction decreases
  • The rate of reaction continues to increase linearly
  • The rate of reaction remains unchanged
  • The rate of reaction reaches a maximum value (correct)

    • What is the term for the maximum rate of an enzyme-catalyzed reaction at high substrate concentrations?

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

    What is the term for the substrate concentration at which the rate of an enzyme-catalyzed reaction is half of the maximum rate?

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

    What is the effect of increasing enzyme concentration on the rate of an enzyme-catalyzed reaction?

    <p>The rate of reaction increases linearly</p> Signup and view all the answers

    What is the purpose of the Lineweaver-Burk plot?

    <p>To determine the Km value</p> Signup and view all the answers

    What is the catalytic efficiency of an enzyme?

    <p>Kcat / Km</p> Signup and view all the answers

    What is the term for the number of times a catalyst enters a reaction to form products per unit time?

    <p>Turnover frequency</p> Signup and view all the answers

    What is the effect of increasing substrate concentration on the Km value?

    <p>Km remains unchanged</p> Signup and view all the answers

    What is the rate of adsorption proportional to?

    <p>Partial pressure of A and the number of vacant sites</p> Signup and view all the answers

    What is the effect of high pressure on the decomposition of PH3?

    <p>The reaction becomes zeroth order</p> Signup and view all the answers

    In the Langmuir-Hinshelwood mechanism, what is the rate of reaction v proportional to?

    <p>The surface coverage of A and B</p> Signup and view all the answers

    What is the relationship between the rate of adsorption and the rate of desorption in the Langmuir isotherm?

    <p>The rate of adsorption is equal to the rate of desorption at equilibrium</p> Signup and view all the answers

    What is the effect of substrate concentration on the reaction rate in the Langmuir-Hinshelwood mechanism?

    <p>The reaction rate is proportional to the substrate concentration</p> Signup and view all the answers

    What is the role of the surface in heterogeneous catalysis?

    <p>The surface acts as a catalyst</p> Signup and view all the answers

    What is the approximate rate of change of intermediate species concentration during the steady-state approximation?

    <p>d[I]/dt ≈ 0</p> Signup and view all the answers

    What is the relationship between the concentration of A and the concentration of intermediate species I under the steady-state approximation?

    <p>[I] ≈ ka [A]/kb</p> Signup and view all the answers

    What is the rate of formation of product P in terms of the concentration of A under the steady-state approximation?

    <p>d[P]/dt = ka [A]</p> Signup and view all the answers

    What is the condition for the steady-state approximation to be a good approximation?

    <p>ka &gt; kb</p> Signup and view all the answers

    What is the relationship between the rate constant k and the temperature T according to the Arrhenius equation?

    <p>k = A exp(-Ea/(RT))</p> Signup and view all the answers

    What is the effect of increasing the temperature by 10 K on the rate constant k?

    <p>k increases by 2-3 times</p> Signup and view all the answers

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