A signal cascade induced by adrenaline or thyroxine
A. must begin with receipt of the signal molecule by a surface receptor
B. involves the activation of a G protein
C. results in the activation of a sequence of enzymes needed for the cell effect
D. all of the above
Answer:D
A signal cascade induced by adrenaline or thyroxine
A. must begin with receipt of the signal molecule by a surface receptor B. involves the activation of a G protein C. results in the activation of a sequence of enzymes needed for the cell effect D. all of the above