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

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

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

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Cell Signalling and Transduction
Cell signaling can be classified into

two distinct types based on the distance over which the signaling molecules act
three distinct types based on the signaling molecules
three distinct types based on the distance over which the signaling molecules act
None of these

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Cell Signalling and Transduction
Which of the following is true about a hydrophilic signaling molecule?

Since it can enter the cell, it directly affects some specific cell process
It is a steroid
It might trigger a signal cascade that causes some effect in a cell
Its receptor is located in the cytosol of the target cell

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

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