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

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

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

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

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