Substance E Is Made in the Pancreas, Travels Through the Blood

question 62

Multiple Choice

Substance E is made in the pancreas, travels through the blood, and binds to a surface receptor on a target cell. After dimerization and autophosphorylation, the receptor activates a signaling protein. Substance E is therefore the ligand for ____.

• A) a receptor tyrosine kinase
• B) a G-protein-coupled receptor
• C) a hormone receptor
• D) a ligand-gated ion channel
• E) guanylyl cyclase

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