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

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

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Cell Signalling and Transduction
If a disease of the blood vessels caused the endothelial cells of the vessel to die, what effect would that have on the cellular activities associated with vasodilation?

Nitric oxide would no longer be produced
All of these
It would be more difficult to increase blood flow and reduce blood pressure
Smooth muscle cells could not be made to relax

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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 in the heart muscle
It is incapable of signal transduction

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