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
Its receptor is located in the cytosol of the target cell
It is a steroid
It might trigger a signal cascade that causes some effect in a cell

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Cell Signalling and Transduction
The binding of ligands to many G-proteins linked receptors leads to shortlived

decrease in the concentration of certain intracellular signaling molecules called second messenger
increase in the concentration of certain extracellular signaling molecules called first messenger
decrease in the concentration of certain extracellular signaling molecules called first messenger
increase in the concentration of certain intracellular signaling molecules called second messenger

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

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