Up to 60% of all medicines used today exert their effects by influencing what structures in the cell membrane? Naim 04:56 AP Biology Practice Questions Up to 60% of all medicines used today exert their effects by influencing what structures in the cell membrane? A) tyrosine-kinases receptors B) ligand-gated ion channel receptors C) growth factors D) G proteins E) cholesterol Answer: D Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+