What terminates GPCR signaling?

Why do only certain cells respond to a ligand?

If phosphodiesterase is inhibited, what happens?

G proteins are activated when:

Which receptors bind hydrophobic ligands?

Signal transduction is best defined as:

Suppose that the cross-price elasticity of demand between two goods is 1.0.  This implies that a price increase in one of the goods will result in

Products with more complements have more elastic demand

The demand for any individual brand is more elastic than industry aggregate demand

In perfectly competitive markets, demand is perfectly elastic and firms are price-takers.