Cell Signalling and Transduction
In paracrine signaling, the signaling molecules affects only

None of these
target cells distant from its site of synthesis in cells of an endocrine organ
target cells close to the cell from which it was secreted
both (a) and (b)

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

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

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

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