Enzymes: General Properties Quiz
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Questions and Answers

What is the main function of a catalyst?

  • To increase the overall time taken for a reaction
  • To change the position of the reaction’s equilibrium
  • To produce a new substance during a reaction
  • To lower the energy needed for a reaction to proceed (correct)

    • In biological catalysis, what did Louis Pasteur conclude about the fermentation of sugar into alcohol by yeast?

  • It only occurs in the absence of living yeast cells
  • It is inhibited by living yeast cells
  • It is catalyzed by 'ferments' inseparable from the structure of living yeast cells (correct)
  • It is not influenced by any external factors

    • What happens to a catalyst during the overall process of a reaction?

  • It is converted into a completely different substance
  • It is temporarily changed but recycled to participate in multiple reactions (correct)
  • It remains unchanged and inactive throughout the reaction
  • It becomes a product of the reaction

    • When do products dissociate from a catalyst in a reaction?

    <p>After the overall process of the reaction is completed</p> Signup and view all the answers

    How does a catalyst affect the rates of biochemical reactions?

    <p>By decreasing the amount of energy needed for the reaction to proceed</p> Signup and view all the answers

    What is the role of enzymes in metabolic reactions?

    <p>To catalyze metabolic reactions</p> Signup and view all the answers

    Why can a bag of sugar remain on the shelf for years without any obvious conversion to CO2 and H2O?

    <p>Because the bag of sugar lacks enzymes for the reaction</p> Signup and view all the answers

    Which of the following best describes the oxidation of glucose in the presence of oxygen?

    <p>A slow and exergonic process</p> Signup and view all the answers

    What would happen if enzymes did not catalyze thermodynamically favorable reactions in living organisms?

    <p>The reactions would occur very slowly or negligibly</p> Signup and view all the answers

    Why is sucrose oxidation mentioned in the text in relation to enzyme catalysis?

    <p>To show that without enzyme catalysis, sucrose oxidation could not occur on a useful time scale</p> Signup and view all the answers

    Enzymes are proteins specialized to catalyze metabolic reactions in living cells.

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

    Glucose, a sugar, can be stored indefinitely on the shelf without deteriorating.

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

    Enzymes slow down thermodynamically favorable reactions in living organisms.

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

    The oxidation of glucose to CO2 and H2O in the presence of oxygen is a highly endergonic process.

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

    Without catalysis, chemical reactions such as sucrose oxidation could occur on a useful time scale and sustain life.

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

    A catalyst changes the position of the reaction's equilibrium.

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

    Enzymes are the only type of catalysts involved in biological catalysis.

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

    Biological catalysis was not recognized until the late 1800s.

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

    A catalyst may be permanently changed during the reaction.

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

    Living systems do not use enzymes to accelerate and control the rates of biochemical reactions.

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

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