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
Two key organizing principles for large multicellular organisms are

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

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Cell Signalling and Transduction
cAMP and cGMP are derived from

GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively
ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively
None of these
ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively

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Cell Signalling and Transduction
Cell signaling can be classified into

three distinct types based on the signaling molecules
three distinct types based on the distance over which the signaling molecules act
two distinct types based on the distance over which the signaling molecules act
None of these

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