Cell Signalling and Transduction
In paracrine signaling, the signaling molecules affects only

None of these
target cells distant from its site of synthesis in cells of an endocrine organ
target cells close to the cell from which it was secreted
both (a) and (b)

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Cell Signalling and Transduction
The binding of ligands to many G-proteins linked receptors leads to shortlived

decrease in the concentration of certain intracellular signaling molecules called second messenger
increase in the concentration of certain extracellular signaling molecules called first messenger
decrease in the concentration of certain extracellular signaling molecules called first messenger
increase in the concentration of certain intracellular signaling molecules called second messenger

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