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

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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

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

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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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