- Thu Sep 16, 2021 11:26 am
I think you're asking only why answer choice (E) is wrong (let me know if I'm wrong). The fluorescing is part of Colwell's method of detecting cholera, but I have no idea if it is or isn't part of the petri dish culturing method, and, whether it is or isn't, it doesn't explain why Colwell's method works better. The petri dish method doesn't always grow cholera because, as the last paragraph states, dormant cholera is viable but not culturable. So a petri dish, which grows cultures, will not show growth. But Colwell's test doesn't really require cholera itself to "do" anything - cholera that's alive but won't grow, because it's dormant, will still have the antibody latch onto it.
Answer choice (E) explains why Colwell's method will work but not why petri dishes won't work in the same circumstances, so it does not resolve the paradox.