Enzymes Chapter 1 by Dr. Zinab Ahmed Abdelgawad
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Questions and Answers

What is the primary function of enzymes in biochemical reactions?

  • To consume the reactants in the reaction
  • To increase the rate of chemical reaction (correct)
  • To decrease the energy of activation
  • To alter the reactants in the reaction

    • What is the term for the area on the enzyme where the substrate binds?

  • Catalytic site
  • Active site (correct)
  • Reaction site
  • Binding site

    • What is the term for the enzyme without its non-protein component?

  • Active enzyme
  • Apoenzyme (correct)
  • Holoenzyme
  • Inactive enzyme

    • What is the role of enzymes in biochemical reactions?

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

    What happens to enzymes during a biochemical reaction?

    <p>They are reusable</p> Signup and view all the answers

    What is the term for the substance on which an enzyme begins its action?

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

    What is the characteristic of a competitive inhibitor molecule?

    <p>It has a similar structure to the substrate molecule</p> Signup and view all the answers

    Where does an allosteric inhibitor molecule bind to the enzyme?

    <p>At an alternative site</p> Signup and view all the answers

    What is the result of an allosteric inhibitor binding to the enzyme?

    <p>Change in enzyme shape, preventing substrate binding</p> Signup and view all the answers

    What is the term used to describe the phenomenon of allosteric inhibition?

    <p>Allosteric effect</p> Signup and view all the answers

    What is the characteristic of an allosteric inhibitor molecule?

    <p>It is structurally different from the substrate molecule</p> Signup and view all the answers

    What is the nature of allosteric inhibition?

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

    What is the primary role of enzymes in a reaction?

    <p>To decrease the activation energy of the reaction</p> Signup and view all the answers

    What is the energy barrier between reactants and products called?

    <p>Activation energy</p> Signup and view all the answers

    Which theory proposes that the active site of the enzyme is complementary in shape to the substrate?

    <p>Lock and key theory</p> Signup and view all the answers

    What is the result of the enzyme-substrate complex forming?

    <p>The substrate is transformed into products</p> Signup and view all the answers

    What is the function of the active site of an enzyme?

    <p>To fit the substrate and facilitate the reaction</p> Signup and view all the answers

    What is the primary difference between the lock and key theory and the induced fit theory?

    <p>The shape of the active site</p> Signup and view all the answers

    What is the relationship between the rate of enzyme action and the concentration of enzyme, provided there is a sufficient supply of substrate and constant conditions?

    <p>The rate of enzyme action is directly proportional to the concentration of enzyme.</p> Signup and view all the answers

    At what point does the reaction rate become maximal?

    <p>When the enzyme is completely saturated with the substrate.</p> Signup and view all the answers

    What is the temperature range at which the optimum temperature is reached in humans?

    <p>37-40 C</p> Signup and view all the answers

    What is the reason for the increase in the rate of reaction with an increase in temperature?

    <p>Increase in the initial energy of the substrate and decrease in the activation energy.</p> Signup and view all the answers

    What happens to the reaction rate when the substrate concentration increases beyond the point of maximum activity?

    <p>The reaction rate remains constant.</p> Signup and view all the answers

    What is the term for the maximum rate of reaction that can be achieved by an enzyme?

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

    What does the enzyme classification number EC: 2.7.1.1 represent?

    <p>Transferases subclass with phosphate as acceptor</p> Signup and view all the answers

    Which enzyme is represented by the code number EC: 1.1.1.1?

    <p>Alcohol dehydrogenase</p> Signup and view all the answers

    What is the specific name of the enzyme with EC: 2.7.1.1?

    <p>ATP,D-HEXOSE-6-PHOSPHOTRANSFERASE</p> Signup and view all the answers

    What is the biochemical activity of oxidoreductases?

    <p>Catalyze oxidation/reduction reactions</p> Signup and view all the answers

    What is the reaction catalyzed by Hexokinase?

    <p>Glucose + ATP → glucose-6-P + ADP</p> Signup and view all the answers

    Which of the following enzymes is an example of a transferase?

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

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