Cell Signalling and Transduction
Which of the following comes under the category of cell surface receptor?

All of these
Enzyme linked receptors
G protein linked receptors
Ion-channel linked receptors

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Cell Signalling and Transduction
A signal cascade induced by adrenaline or thyroxine

involves the activation of a G protein
results in the activation of a sequence of enzymes needed for the cell effect
All of these
must begin with receipt of the signal molecule by a surface receptor

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

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

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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
is broken down into hormones that affect the heart
mimics the action of signal receptors
breaks down into nitric oxide, which increases blood flow to the heart

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