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
both (a) and (b)
target cells close to the cell from which it was secreted

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Cell Signalling and Transduction
Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*?

Because nitric oxide breaks down quickly and thus cannot travel far
Because other body tissues use a different signaling molecule
Because nitric oxide cannot cross cell membranes and enter the blood
None of these

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Cell Signalling and Transduction
Self-phosphorylation is an excellent mechanism for triggering specific catalytic function of the proteins involved in signal cascades because it

makes the receptor more likely to capture the signaling, molecule
allows hydrophilic signaling molecules to cross the plasma membrane
None of these
changes the shape and thus the enzymatic activity of the proteins involved

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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 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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