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Receptor antagonist: Quiz


Question 1: A receptor antagonist is a type of receptor ligand or ________ that does not provoke a biological response itself upon binding to a receptor, but blocks or dampens agonist-mediated responses.
PhencyclidineMDMAPsychoactive drugDrug

Question 2: [1] In ________, antagonists have affinity but no efficacy for their cognate receptors, and binding will disrupt the interaction and inhibit the function of an agonist or inverse agonist at receptors.
H2 antagonistPharmaceutical drugPharmacologyAntibiotic

Question 3: Biochemical receptors are large protein molecules that can be activated by the binding of a ligand (such as a hormone or ________).
PhencyclidineDrugPsychoactive drugMDMA

Question 4: [23] ________, used in the treatment of Alzheimer's disease, is an uncompetitive antagonist of the NMDA receptor.

Question 5: For example, histamine lowers arterial pressure through vasodilation at the histamine H1 receptor, while ________ raises arterial pressure through vasoconstriction mediated by β-adrenergic receptor activation.

Question 6: [3] Receptors can be membrane-bound, occurring on the cell membrane of cells, or intracellular, such as on the nucleus or ________.
MitochondrionSuccinate dehydrogenaseMitochondrial DNAPyruvate dehydrogenase complex

Question 7: Phenoxybenzamine is an example of an irreversible alpha blocker—it permanently binds to α adrenergic receptors, preventing ________ and noradrenaline from binding.

Question 8: Non-competitive antagonists (sometimes called non-surmountable antagonists) are ________ antagonists.
ProteinEnzymeAllosteric regulationEnzyme inhibitor

Question 9: Our understanding of the mechanism of drug induced receptor activation and ________ and the biochemical definition of a receptor antagonist continues to evolve.
Inverse agonistReceptor (biochemistry)Schild regressionReceptor theory

Question 10: [19] The ________ receptor antagonist, IL-1Ra is an example of a competitive antagonist.
IL1ATumor necrosis factor-alphaInterleukin 1CXCL14


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