Cell Signalling and Transduction
The enzyme that catalyzes the splitting of PIP2 into two molecules of inositol triphosphate (IP3) and diacylglycerol in cell signaling, is

phospholipase C
lipokinase
phosphodiesterase C
phosphokinase C

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Cell Signalling and Transduction
A signal cascade induced by adrenaline or thyroxine

All of these
results in the activation of a sequence of enzymes needed for the cell effect
involves the activation of a G protein
must begin with receipt of the signal molecule by a surface receptor

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