Cell Signalling and Transduction
In the signal transduction mechanism known as protein phosphorylation

receptor kinases play a key role in triggering the signal cascade
All of these
the signaling molecule binds to a surface receptor
phosphorylated proteins act with enzymes to trigger the signal cascade

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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
None of these
allows hydrophilic signaling molecules to cross the plasma membrane
changes the shape and thus the enzymatic activity of the proteins involved

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