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

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

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

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Cell Signalling and Transduction
The signaling molecules called steroid hormones

are hydrophilic and so cannot penetrate the plasma membrane
never enter the blood of humans
bind to cell surface receptors to trigger chemical cascades
are made in one location of the body but have their effects some distance away

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