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
lipokinase
phosphodiesterase C
phospholipase C

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Cell Signalling and Transduction
In terms of cell communication, what do bacterial pathogens such as cholera and anthrax have in common?

They block the normal functioning of signal transduction mechanisms
They alter the chemical structure of key signaling molecules
They destroy the receptors for key signaling molecules
They prevent the production of key signaling molecules

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

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

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