PrepTest 121, Section 3, Question 21
The first thing any embryo must do before(467 more words not shown)
The passage suggests that the(14 more words not shown)
- AThe simpler the(14 more words not shown)
- BScientists have determined(8 more words not shown)
- CScientists will try(8 more words not shown)
- DVery few observations(15 more words not shown)
- ESimpler organisms take(9 more words not shown)
Reading the passage
We know several examples of early polarity, but the mammalian mechanism remains unresolved. For this broad agreement question, I'll distinguish what the writer says researchers know, what they still want to understand, and what the examples don't establish.
Working the answers
- A
No general relationship is given between simplicity and speed of development. The fruit fly's timing doesn't establish a rule across organisms.
- B
Frogs are offered as an example of some simpler vertebrates with a suspected sperm-driven mechanism. That doesn't show that scientists have determined the mechanisms in most simple vertebrates.
- CCorrect
The mammalian mechanism is called a “tempting mystery to researchers.” That description supports an expectation that scientists will investigate how polarity is established in humans, rather than treat the unknown as uninteresting.
- D
This conflicts with the described similarities after polarity is established. The final paragraph emphasizes shared genetic mechanisms across species, including the eye-development example. It doesn't support a claim that very few later observations generalize.
- E
No general ranking says simpler organisms take longer to establish polarity. Mammalian polarity is described as developing later than the sperm-driven process discussed just before it, and the account supplies no broad slower-for-simpler rule.
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