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

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

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

All of these
results in the activation of a sequence of enzymes needed for the cell effect
involves the activation of a G protein
must begin with receipt of the signal molecule by a surface receptor

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