Pharmacodynamics-2 BSc Biomedical Sciences Quiz: Ion Channels and Drug Examples
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Questions and Answers

Which type of inhibition is characterized by drug binding to the enzyme site only after the substrate binds?

  • Uncompetitive inhibition (correct)
  • Irreversible inhibition
  • Non-competitive inhibition
  • Competitive inhibition

Which enzyme target is associated with the clinical use of ACE inhibitors like captopril?

  • HMG-CoA reductase
  • Thyroid peroxidase
  • Angiotensin converting enzyme (correct)
  • Cycloxygenase enzymes

Which transporter family utilizes energy derived from downhill movement of a solute to transport molecules in secondary active transport?

  • Solute-carrier (SLC) family (correct)
  • Membrane pumps
  • ATP-Binding Cassette (ABC) superfamily
  • Membrane channels

Which transporter, also known as MDR1 transporter, affects the pharmacokinetics of drugs by affecting entry and exit from selective tissues?

<p>P-glycoprotein (P-gp) efflux pumps (B)</p> Signup and view all the answers

Which type of secondary active transporters use the flow of one molecule/ion to move another in the opposite direction?

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

Which type of ion channels open and close depending on transmembrane potentials?

<p>Voltage-gated ion channels (D)</p> Signup and view all the answers

Which drug is classified as a calcium channel blocker?

<p>Amlodipine (A)</p> Signup and view all the answers

Which type of enzyme inhibition is characterized by the drug binding to the allosteric site?

<p>Non-competitive inhibition (A)</p> Signup and view all the answers

What effect can be observed by increasing the substrate concentration in competitive enzyme inhibition?

<p>Reduction in inhibitor effects (C)</p> Signup and view all the answers

Which drug is classified as a sodium channel blocker used as a local anesthetic?

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

Which type of inhibition is characterized by the drug binding to the allosteric site?

<p>Uncompetitive inhibition (A)</p> Signup and view all the answers

Which drug is classified as a potassium channel blocker used for antiarrhythmic purposes?

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

Which type of ion channels open and close depending on transmembrane potentials?

<p>Voltage-gated ion channels (D)</p> Signup and view all the answers

Which enzyme inhibition type is characterized by the effects of the inhibitor being reduced by increasing substrate concentration?

<p>Competitive inhibition (D)</p> Signup and view all the answers

Which drug is classified as a calcium channel blocker used as an antihypertensive?

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

Which of the following statements best characterizes uncompetitive inhibition?

<p>The drug binds to the enzyme site only after the substrate binds, with minimal displacement and decreased Vmax (C)</p> Signup and view all the answers

Which enzyme target is associated with the clinical use of HMG-CoA reductase inhibitors like atorvastatin and rosuvastatin?

<p>HMG-CoA reductase (A)</p> Signup and view all the answers

Which transporter family utilizes energy from ATP hydrolysis to actively move ions or drug molecules against their electrochemical gradient?

<p>ATP-Binding Cassette (ABC) superfamily of transporters (B)</p> Signup and view all the answers

Which type of transporters use the natural flow of one molecule/ion to move another in the same direction against its electrochemical gradient?

<p>Symporters (Cotransporters) (D)</p> Signup and view all the answers

Which type of enzyme inhibition is characterized by drug binding to the enzyme site only after the substrate binds, with minimal displacement and decreased Vmax?

<p>Uncompetitive inhibition (B)</p> Signup and view all the answers

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