Drug Metabolism and Pharmacological Action Quiz

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Questions and Answers

What is the term used to describe the bimodal acetylation pattern of drugs like isoniazid in the human population?

  • Acetylation modulation
  • Acetylation variation
  • Acetylation biogenesis
  • Acetylation polymorphism (correct)

Which enzyme activity mainly causes the genetic variation leading to differences in acetylation patterns among individuals?

  • N-acetyltransferase activity (correct)
  • Monoamine oxidase activity
  • Methyltransferase activity
  • Sulfotransferase activity

Individuals classified as rapid acetylators are more likely to exhibit which of the following responses to drugs?

  • Developing allergic reactions
  • Experiencing adverse reactions
  • Showing inadequate therapeutic responses (correct)
  • Having optimal drug efficacy

In methylation, what is the primary source of the methyl group used in the metabolic reactions?

<p><strong>S-adenosylmethionine</strong> (A)</p> Signup and view all the answers

Which biological activity does methylation aim to terminate by acting on biogenic amines like norepinephrine and histamine?

<p><strong>Terminating biological activity</strong> (D)</p> Signup and view all the answers

In methylation, what is the primary purpose of the metabolic pathway with respect to endogenous compounds?

<p><strong>Biosynthesis of endogenous compounds</strong> (D)</p> Signup and view all the answers

Which enzyme is often involved in methylation reactions?

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

What is the role of S-adenosylmethionine (SAM) in metabolism?

<p>It is a methyl donor in methylation reactions (D)</p> Signup and view all the answers

Which type of metabolites can be formed from methylation reactions?

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

Quaternary ammonium derivatives are often used for which purpose?

<p>As antimicrobial agents (B)</p> Signup and view all the answers

Which of these factors can affect the rate of drug metabolism?

<p>All of the above (D)</p> Signup and view all the answers

What is stereoselectivity in drug metabolism?

<p>The preferential interaction of one enantiomer with drug-metabolizing enzymes (D)</p> Signup and view all the answers

Which compound is created when methylation leads to a polar or water-soluble metabolite?

<p>Quaternary ammonium derivative (D)</p> Signup and view all the answers

Which enzyme catalyzes methylation reactions using S-adenosylmethionine (SAM)?

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

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

<p>Catechol-O-methyltransferase (COMT) (D)</p> Signup and view all the answers

Which coenzyme is involved in the methylation of histamine, serotonin, and epinephrine by specific transferases?

<p>S-adenosylmethionine (SAM) (D)</p> Signup and view all the answers

Which drugs undergo significant O-methylation, N-methylation, and S-methylation by various Methyltransferases?

<p>Drugs with aromatic amines (B)</p> Signup and view all the answers

What is the functional group required for the enzyme COMT to carry out methylation in the above-mentioned drugs?

<p>Catecholic functionality (B)</p> Signup and view all the answers

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