Drug Metabolism and Pharmacological Action Quiz
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Questions and Answers

Which enzyme is responsible for the O-methylation of important neurotransmitters such as norepinephrine and dopamine?

  • Catechol-O-methyltransferase (COMT) (correct)
  • Epinephrine-O-methyltransferase
  • Histamine-O-methyltransferase
  • Serotonin-O-methyltransferase
  • Which of the following is the activated coenzyme involved in methylation reactions?

  • S-adenosylcysteine (SAC)
  • S-adenosylmethionine (SAM) (correct)
  • S-adenosylglutathione (SAG)
  • S-adenosylhomocysteine (SAH)
  • Which type of methylation reaction does not create a quaternary ammonium derivative and thus tends to result in pharmacologically inactive compounds?

  • N-methylation
  • C-methylation
  • O-methylation (correct)
  • S-methylation
  • Which of the following methyltransferases is NOT typically involved in the metabolism of xenobiotics?

    <p>Histamine-specific N-methyltransferase</p> Signup and view all the answers

    Which of the following is NOT an example of a phase II reaction involving a conjugation process?

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

    Which of the following factors affects the metabolism of drugs and xenobiotics the most?

    <p>The metabolism of several different phase I and phase II pathways</p> Signup and view all the answers

    Which metabolic pathway is primarily responsible for terminating the biological activity of biogenic amines?

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

    Which of the following drugs exhibits acetylation polymorphism resulting in variable therapeutic and toxicological responses?

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

    Which of the following populations is typically categorized as slow acetylators?

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

    Which phase II reaction is least likely to be involved in the metabolism of drugs and xenobiotics?

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

    Which of the following biogenic amines is not primarily metabolized via methylation?

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

    Which of the following statements about acetylation polymorphism is true?

    <p>Slow acetylators are more likely to show an inadequate therapeutic response to standard drug doses</p> Signup and view all the answers

    What is the primary determinant of the relative amount of a particular metabolite?

    <p>The concentration and activity of the enzyme(s) responsible for biotransformation</p> Signup and view all the answers

    What is the consequence of a decreased rate of metabolism of a drug?

    <p>Increased intensity and duration of the drug action</p> Signup and view all the answers

    What is a factor that can affect drug metabolism and is influenced by the drug's chemical structure?

    <p>Chemical factor</p> Signup and view all the answers

    What type of stereoselectivity refers to the preferential interaction of one stereoisomer with metabolizing enzymes at a specific region of the molecule?

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

    What is the consequence of an increased rate of metabolism of a drug?

    <p>Decreased intensity and duration of the drug action</p> Signup and view all the answers

    What is an example of a biological factor that can affect drug metabolism?

    <p>Nutritional status</p> Signup and view all the answers

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