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

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

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Cell Signalling and Transduction
cAMP and cGMP are derived from

ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively
ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively
GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively
None of these

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Cell Signalling and Transduction
A signal cascade induced by adrenaline or thyroxine

All of these
involves the activation of a G protein
must begin with receipt of the signal molecule by a surface receptor
results in the activation of a sequence of enzymes needed for the cell effect

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