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

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

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Cell Signalling and Transduction
Cell signaling can be classified into

three distinct types based on the distance over which the signaling molecules act
three distinct types based on the signaling molecules
None of these
two distinct types based on the distance over which the signaling molecules act

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Cell Signalling and Transduction
Nitroglycerin has long been administered to human patients suffering from chronic chest pain (angina). This medication works because it

interferes with chemical cascades that trigger contraction of heart muscle
mimics the action of signal receptors
is broken down into hormones that affect the heart
breaks down into nitric oxide, which increases blood flow to the heart

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