Cell Signalling and Transduction
When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ .

signaling molecule; receptor; G proteins
kinase; receptor; proteases
signaling molecule; target cell; G proteins
signaling molecule; target cell; receptors

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

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

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

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