Free notes, MCQs, tables & flowcharts for NEET-PG Biochemistry
G-protein coupled receptor that does not act through opening of potassium channels is:
ADopamine D2 receptor
BMuscarinic M2 receptor
CSerotonin 5 HT 1 receptor
DAngiotensin 1 receptor
Which of the following stimulate adenylate cyclase with G-protein coupled action ?
AShiga toxin
BCholera toxin
CDiphtheria toxin
DPseudomonas toxin
Which of the following statements about G protein-coupled receptors (GPCRs) is correct?
AThe alpha subunit of G proteins determines whether they are stimulatory or inhibitory.
BG proteins bind hormones directly before transmitting signals to receptors.
CG proteins are active when bound to GDP and inactive when bound to GTP.
DG proteins require the beta and gamma subunits to remain bound to the alpha subunit to transmit signals.
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