Cell Signalling and Transduction
What is the name of the protein signaling molecule that alters glucose uptake, and where would its receptors be located?

PDGF; the blood
Insulin; beta cells of the pancreas
Insulin; many different cell types that use glucose for fuel
NGF; the nerves involved in simple reflexes

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

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

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