Cell Signalling and Transduction
Two key organizing principles for large multicellular organisms are

prokaryotic cell structure and cell specialization
simple nerve reflexes and cell specialization
communication between cells and simple nerve reflexes
cell specialization and communication between cells

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

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

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Cell Signalling and Transduction
Cell signaling can be classified into

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

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