If a hormone caused an increase in protein kinase activity, predict the type of hormone responsible and the
intracellular signaling mechanism of its action.
What will be an ideal response?
ANSWER: The hormone is most likely an amine or peptide--or other hydrophilic molecule. The
receptor is a membrane bound receptor and a type of second messenger mechanism is
involved. The second messenger could either be cyclic AMP or G-proteins. In either case,
the hormone-receptor complex would either activate adenylyl cyclase or G-proteins. As a
result, protein kinase would be activated by the second messenger products
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