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

phosphokinase C
phosphodiesterase C
lipokinase
phospholipase C

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Cell Signalling and Transduction
Two key organizing principles for large multicellular organisms are

communication between cells and simple nerve reflexes
cell specialization and communication between cells
simple nerve reflexes and cell specialization
prokaryotic cell structure and cell specialization

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