Cell Signalling and Transduction
Self-phosphorylation is an excellent mechanism for triggering specific catalytic function of the proteins involved in signal cascades because it

makes the receptor more likely to capture the signaling, molecule
changes the shape and thus the enzymatic activity of the proteins involved
None of these
allows hydrophilic signaling molecules to cross the plasma membrane

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Cell Signalling and Transduction
Cell signaling can be classified into

None of these
three distinct types based on the signaling molecules
three distinct types based on the distance over which the signaling molecules act
two 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 block the normal functioning of signal transduction mechanisms
They prevent the production of key signaling molecules
They alter the chemical structure of key signaling molecules
They destroy the receptors for key signaling molecules

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