olutayo Posted January 10, 2008 Share Posted January 10, 2008 Mice that have been given morphine are very likely to develop blood poisoning because bacteria that normally reside in the intestine typically respond to morphine by migrating into the bloodstream. However, when mice are given both morphine and the new drugnaltrexone, blood poisoning is much less frequent, although it does still occur. These results provide support for researchers’ prediction that naltrexone will turn out to be toxic to certain types of bacteria. Which of the following, if discovered to be true, would most seriously weaken the support for the researchers’ prediction? A. After being administered to mice, naltrexone does not pass from the bloodstream into the intestine. B. Naltrexone inhibits morphine from triggering the migration of intestinal bacteria into the bloodstream. C. Mice that have been given naltrexone but not morphine have no greater risk of developing blood poisoning than do mice that have not been given either substance. D. The increased risk of blood poisoning is not the only harmful effect on mice of being given morphine. E. Conditions other than the presence of intestinal bacteria in the bloodstream can cause blood poisoning in mice. Quote Link to comment Share on other sites More sharing options...
zuckerman Posted January 10, 2008 Share Posted January 10, 2008 Imo B. Quote Link to comment Share on other sites More sharing options...
siliconfish Posted January 11, 2008 Share Posted January 11, 2008 B. Naltrexone inhibits morphine from triggering the migration of intestinal bacteria into the bloodstream. Correct Quote Link to comment Share on other sites More sharing options...
gmat009 Posted August 6, 2008 Share Posted August 6, 2008 Can someone explain how B is weakening scientist hypothesis Quote Link to comment Share on other sites More sharing options...
satyamsinha Posted August 6, 2008 Share Posted August 6, 2008 Mice that have been given morphine are very likely to develop blood poisoning because bacteria that normally reside in the intestine typically respond to morphine by migrating into the bloodstream. However, when mice are given both morphine and the new drugnaltrexone, blood poisoning is much less frequent, although it does still occur. These results provide support for researchers’ prediction that naltrexone will turn out to be toxic to certain types of bacteria. Which of the following, if discovered to be true, would most seriously weaken the support for the researchers’ prediction? Assumption: Naltrexone is destroying the bacteria which has come into the bloodstream. Lets look at the choices: A. After being administered to mice, naltrexone does not pass from the bloodstream into the intestine. In this option, N did not go into the intestine, which means it reduced the bacteria by staying in the blood stream. This option doesn't refute the assumption. B. Naltrexone inhibits morphine from triggering the migration of intestinal bacteria into the bloodstream. This option gives a reason other than the assumption stated above so it is weakening the assumption. C. Mice that have been given naltrexone but not morphine have no greater risk of developing blood poisoning than do mice that have not been given either substance. This option says N does not cause blood poisoning. Dont care ! D. The increased risk of blood poisoning is not the only harmful effect on mice of being given morphine. This option is orthogonal. Dont care ! E. Conditions other than the presence of intestinal bacteria in the bloodstream can cause blood poisoning in mice. Again tangential thought. Dont care ! Hope this helps ! Quote Link to comment Share on other sites More sharing options...
manasdas Posted August 6, 2008 Share Posted August 6, 2008 I could harldy find anything in the options.. but select E Quote Link to comment Share on other sites More sharing options...
NishantG Posted August 7, 2008 Share Posted August 7, 2008 B for me Option E "Conditions other than the presence of intestinal bacteria in the bloodstream can cause blood poisoning in mice." does not seem to weaken the conclusion that "naltrexone will turn out to be toxic to certain types of bacteria." Quote Link to comment Share on other sites More sharing options...
Retake_GMAT Posted August 7, 2008 Share Posted August 7, 2008 I vote for B. If the drug prevents the bacteria movement , then it cannot be fatal to the bacteria, Quote Link to comment Share on other sites More sharing options...
quiver Posted August 7, 2008 Share Posted August 7, 2008 I go with B Quote Link to comment Share on other sites More sharing options...
quiver Posted August 7, 2008 Share Posted August 7, 2008 I go with B Quote Link to comment Share on other sites More sharing options...
gmatcraze Posted August 7, 2008 Share Posted August 7, 2008 I vote for B. If the drug prevents the bacteria movement , then it cannot be fatal to the bacteria, Stimulus states that presence of intestinal bacteria in the bloodstream causes blood poisoning. According to (B), naltrexone curbs the migration of intestinal bacteria into the bloodstream. That means there should no longer be a case of blood poisioning in mice. But one of the premises is that " ... when mice are given both morphine and the new drug naltrexone, blood poisoning is much less frequent, although it does still occur". Since blood poisoning still persists in some mice, there must be some other cause. This is what E says. And it weakens the argument. IMO E Quote Link to comment Share on other sites More sharing options...
shilpishrestha Posted August 9, 2008 Share Posted August 9, 2008 One more vote for B. Quote Link to comment Share on other sites More sharing options...
Mohiita Posted August 10, 2008 Share Posted August 10, 2008 imo b Quote Link to comment Share on other sites More sharing options...
gmatcraze Posted August 11, 2008 Share Posted August 11, 2008 @olutayo: Please post the OA ... thanks Quote Link to comment Share on other sites More sharing options...
cubicle Posted August 11, 2008 Share Posted August 11, 2008 It looks like B is the winner. Can we have the OA please? Quote Link to comment Share on other sites More sharing options...
vinscorpion Posted August 12, 2008 Share Posted August 12, 2008 Stimulus states that presence of intestinal bacteria in the bloodstream causes blood poisoning. According to (B), naltrexone curbs the migration of intestinal bacteria into the bloodstream. That means there should no longer be a case of blood poisioning in mice. But one of the premises is that " ... when mice are given both morphine and the new drug naltrexone, blood poisoning is much less frequent, although it does still occur". Since blood poisoning still persists in some mice, there must be some other cause. This is what E says. And it weakens the argument. IMO E I would agree with gmatcraze Quote Link to comment Share on other sites More sharing options...
coolaman Posted August 12, 2008 Share Posted August 12, 2008 The argument concludes that naltrexone will turn out to be toxic to certain types of bacteria because when mice are given both morphine and the naltrexone, blood poisoning is much less frequent. If we can prove that the blood poisoning is less frequent not because naltrexone is toxic to bacteria but because some other reason then the argument can be weakened. B provides the reason. Quote Link to comment Share on other sites More sharing options...
diehard800 Posted August 14, 2008 Share Posted August 14, 2008 Pl post the OA ........ Per my opinion ......B should be the answer if simultaneous effect of 2 is not achieving an effect of solo one of them then obviously the second is doing something to inhibit the effect of the first one........ OA Pl Quote Link to comment Share on other sites More sharing options...
maverick08 Posted August 14, 2008 Share Posted August 14, 2008 I went with E. Agree with gmatcraze. E is the only option that gives reasoning that there can be some other causes. Ignored B, because B, in a way, is supporting the argument by saying that blood poisoning is reduced/ doesn't happen, because the drug is, actually, inhibiting the bacteria. Would appreciate more discussions. Quote Link to comment Share on other sites More sharing options...
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