#1. "an action potential maybe generated only when the outside of the cell reaches the threshold." this sentence is from topscore test #1 (quesiton #19). Do you agree that? I think "an action potential generated when the in side of the cell reaches the threshold" is right. can anybody explain? #2. which of the following produces bile and emulsifies fat? do you think this question makes sense? "Liver" produces bile, and 'gall bladder' stores and secrets bile to small intestine, and bile emulsifies fat in "small intestine" I think this question should be changed to "which of the following produces bile that emulsifies fat?" #3. 4-isopropyl-3,5-dimethyloctane vs. 3,5-dimethyl-4-isopropyloctane... which is right?