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

phosphodiesterase C
phospholipase C
phosphokinase C
lipokinase

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Cell Signalling and Transduction
Nitroglycerin has long been administered to human patients suffering from chronic chest pain (angina). This medication works because it

mimics the action of signal receptors
interferes with chemical cascades that trigger contraction of heart muscle
is broken down into hormones that affect the heart
breaks down into nitric oxide, which increases blood flow to the heart

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