Drug-receptor interactions

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Quiz by MedSoc
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Last updated: April 9, 2019
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First submittedApril 9, 2019
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Average score12.5%
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Hint
Answer
What type of molecule when it binds to a receptor produces (increases) a response?
Agonist
What about a ligand determines how much of it binds to a receptor given its concentration?
Affinity
What is the relationship between the amount of receptors occupied and the size of the response?
Efficacy
Addition of a competetive antagonist will shift a log concentration/response curve in what direction?
Right
A sequence of experiments to determine the relative potency of a group of structurally related compounds is a what?
Structure activity series
What is it called when a receptor requires more than one molecule binding to be activated?
Co-operativity
What molecule does cAMP produced by adenyly cyclase control cell functions through?
Protein Kinase A/PKA
What phenomenon is seen when after a prolonged exposure to an agonist the receptor is prevented from producing its normal effect?
Desensitization
Hint
Answer
Three processes are involved in this phenomenon uncoupling, sequestration and last?
Down-regulation
This phenomenon has 2 key forms for Beta adrenoreceptors, heterologous and homologous. In heterologous PKA phosophorylates the receptor but is not specific, in homologous, what enzyme phosphorylates it?
Beta-adrenoreceptor kinase/BARK
After this the binding of what protein uncouples the receptor?
Beta arrestin
Which type of this phenomenon occurs with high concentrations of ligand?
Homologous
What type of receptor sometimes requires dimerization in order to autophosphorylate?
Tyrosine kinase
What is it called if a drug is more effective when the target is being used more frequently?
Use dependence
In alphabetical order what are the three types of voltage gated Ca2+ channels found in muscle?
L, N and T
What type of molecules are used to switch the channels between modes (0=channel not open, 1=channel opening in bursts, 2=very long openings)?
Dihydropyridines/DHP
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