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

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

involves the activation of a G protein
All of these
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

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Cell Signalling and Transduction
The binding of ligands to many G-proteins linked receptors leads to shortlived

increase in the concentration of certain extracellular signaling molecules called first messenger
increase in the concentration of certain intracellular signaling molecules called second messenger
decrease in the concentration of certain intracellular signaling molecules called second messenger
decrease in the concentration of certain extracellular signaling molecules called first messenger

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