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Enzyme Activation Energy quiz

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  • What is activation energy (EA) in a chemical reaction?
    Activation energy is the minimum amount of energy required to start a chemical reaction, defined as the difference in energy between the reactants and the transition state.
  • How is the transition state defined in a chemical reaction?
    The transition state is a temporary state of maximum energy during a reaction, represented at the peak of the energy curve.
  • What does a higher activation energy indicate about the speed of a reaction?
    A higher activation energy means the reaction will proceed more slowly.
  • How does the activation energy affect the rate of a chemical reaction?
    The lower the activation energy, the faster the reaction; the higher the activation energy, the slower the reaction.
  • In an exergonic reaction, how do the energies of reactants and products compare?
    In an exergonic reaction, the reactants have higher energy than the products.
  • What role do enzymes play in chemical reactions?
    Enzymes catalyze reactions by lowering the activation energy, which increases the reaction rate.
  • How is activation energy represented on a reaction energy graph?
    Activation energy is shown as the energy difference between the reactants and the transition state, typically as a vertical distance on the graph.
  • What happens to the activation energy in the presence of an enzyme?
    The activation energy is significantly lowered in the presence of an enzyme.
  • Why do reactions occur faster with enzymes?
    Reactions occur faster with enzymes because enzymes lower the activation energy barrier.
  • Does every chemical reaction have an activation energy?
    Yes, all reactions, including exergonic and endergonic, have an activation energy.
  • What is the main takeaway about enzymes and activation energy?
    Enzymes speed up chemical reactions by lowering the energy of activation.
  • On a reaction coordinate graph, where is the transition state located?
    The transition state is located at the peak of the energy curve.
  • How does the activation energy without an enzyme compare to that with an enzyme?
    The activation energy without an enzyme is much higher than with an enzyme.
  • What does a lower activation energy mean for the transition state?
    A lower activation energy means the transition state is at a lower energy level, making it easier for the reaction to proceed.
  • What is the abbreviation commonly used for activation energy?
    Activation energy is commonly abbreviated as EA.