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 (C)</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 (D)</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 (C)</p> Signup and view all the answers

What is the purpose of the Lineweaver-Burk plot?

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

What is the catalytic efficiency of an enzyme?

<p>Kcat / Km (D)</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 (C)</p> Signup and view all the answers

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

<p>Km remains unchanged (A)</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 (D)</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 (A)</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 (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 (B)</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 (D)</p> Signup and view all the answers

What is the role of the surface in heterogeneous catalysis?

<p>The surface acts as a catalyst (C)</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 (D)</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 (A)</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] (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 (C)</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)) (C)</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 (C)</p> Signup and view all the answers

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