Cell Signalling and Transduction
cAMP and cGMP are derived from

None of these
GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively
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
Cell signaling can be classified into

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
None of these

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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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