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

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Cell Signalling and Transduction
Two key organizing principles for large multicellular organisms are

cell specialization and communication between cells
simple nerve reflexes and cell specialization
communication between cells and simple nerve reflexes
prokaryotic cell structure and cell specialization

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