Cell Signalling and Transduction
When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ .

signaling molecule; target cell; receptors
signaling molecule; receptor; G proteins
signaling molecule; target cell; G proteins
kinase; receptor; proteases

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Cell Signalling and Transduction
cAMP and cGMP are derived from

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

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Cell Signalling and Transduction
In the signal transduction mechanism known as protein phosphorylation

All of these
receptor kinases play a key role in triggering the signal cascade
phosphorylated proteins act with enzymes to trigger the signal cascade
the signaling molecule binds to a surface receptor

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