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
None of these
Because nitric oxide breaks down quickly and thus cannot travel far
Because nitric oxide cannot cross cell membranes and enter the blood

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Cell Signalling and Transduction
In the signal transduction mechanism known as protein phosphorylation

All of these
the signaling molecule binds to a surface receptor
receptor kinases play a key role in triggering the signal cascade
phosphorylated proteins act with enzymes to trigger the signal cascade

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

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

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