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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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?

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

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Cell Signalling and Transduction
The signaling molecules called steroid hormones

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

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