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

All of these
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
involves the activation of a G protein

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Cell Signalling and Transduction
Cell signaling can be classified into

three distinct types based on the signaling molecules
three distinct types based on the distance over which the signaling molecules act
None of these
two distinct types based on the distance over which the signaling molecules act

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