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

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

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Cell Signalling and Transduction
In terms of cell communication, what do bacterial pathogens such as cholera and anthrax have in common?

They destroy the receptors for key signaling molecules
They block the normal functioning of signal transduction mechanisms
They alter the chemical structure of key signaling molecules
They prevent the production of key signaling molecules

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