Agonist Lipid bilayer B G G АТР active CAMP PDE ÞAMP Phosphorylation of target proteins РКА active The illustration shows a G protein coupled receptor (GPCR) linked to a second messenger signalling...

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Extracted text: Agonist Lipid bilayer B G G АТР active CAMP PDE ÞAMP Phosphorylation of target proteins РКА active The illustration shows a G protein coupled receptor (GPCR) linked to a second messenger signalling pathway. The activated G protein causes an increase in levels of CAMP. (a) What is the name of the enzyme labelled as B? (b) GPCRS can couple to different G proteins. Which class, from the options Ga, G., G or G12/13, is the receptor shown here? Explain where signal amplification can occur in this second messenger pathway (c)