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

lipokinase
phospholipase C
phosphokinase C
phosphodiesterase C

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Cell Signalling and Transduction
When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ .

kinase; receptor; proteases
signaling molecule; target cell; receptors
signaling molecule; receptor; G proteins
signaling molecule; target cell; G proteins

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Cell Signalling and Transduction
A cell is known to respond to a particular signaling molecule. Which of the following must be true of this cell?

It contains the receptor for the signaling molecule
It is incapable of signal transduction
It is in the heart muscle
It is also the site of production for the signaling molecule

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

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