Cell Signalling and Transduction
cAMP and cGMP are derived from

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

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

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

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