Cell Signalling and Transduction
Cell signaling can be classified into

None of these
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

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

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Cell Signalling and Transduction
A cell is known to respond to a particular signaling molecule. Which of the following must be true of this cell?

It is incapable of signal transduction
It is in the heart muscle
It is also the site of production for the signaling molecule
It contains the receptor for the signaling molecule

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