Cell Signalling and Transduction
What is the name of the protein signaling molecule that alters glucose uptake, and where would its receptors be located?

Insulin; beta cells of the pancreas
Insulin; many different cell types that use glucose for fuel
NGF; the nerves involved in simple reflexes
PDGF; the blood

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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
phosphorylated proteins act with enzymes to trigger the signal cascade
the signaling molecule binds to a surface receptor

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Cell Signalling and Transduction
Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*?

Because nitric oxide breaks down quickly and thus cannot travel far
Because other body tissues use a different signaling molecule
Because nitric oxide cannot cross cell membranes and enter the blood
None of these

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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
must begin with receipt of the signal molecule by a surface receptor
All of these

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