Cell Signalling and Transduction
Which of the following statements about G proteins is false?

They bind to and are regulated by guanine nucleotides
They are involved in signal cascades
They must be active before the cell can make needed cAMP
They become activated when bound to GDP

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

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