Answer 22- d) activation of adenylyl cyclase by Ga subunit.
Reason- It is associated with signal-transduction pathways. It consists of a regulatory subunit and a calalytic subunit.The alpha unit binds to adenylyl cyclase, which converts ATP into cyclic AMP. The cyclic AMP binds to a regulatory subunit , that leads to a conformational change. Thus the catalytic subunit becomes active. Thus protein kinase A get activates.
Answer 21- a) the dimerized receptor acts as a kinase to phosphorylate one or more tyrosine residues on its dimerized partner.
Reason- it is the part of the insulin transduction pathway. After insulin enters the blood stream, it binds with the alpha-subunit of the glycoprotein receptor, which causes activation of tryosine kinase domains on each of the two beta-subunit. This causes auto-phosphorylation of several tyrosine residues in the beta-subunits.
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