PrepTest 121, Section 3, Question 27
The first thing any embryo must do before(467 more words not shown)
The author's primary purpose in(4 more words not shown)
- Aarticulate a theory(15 more words not shown)
- Bdescribe a phase(20 more words not shown)
- Cprovide a classification(11 more words not shown)
- Dargue that a(14 more words not shown)
- Eexplain why an(12 more words not shown)
Reading the passage
Our main point was the difference between varied early polarity mechanisms and similar later development. For purpose, describe what the writer does with that contrast: explain the early differences and show why they are surprising.
Working the answers
- A
We aren't getting one proposed theory of how polarity is established, tested against data. The account describes distinct mechanisms and acknowledges that the mammalian one remains unknown.
- BCorrect
The phase is establishing early polarity, and disparate means different. The surprise is that nearly identical-looking early embryos use different mechanisms, while later, visibly distinct organisms rely on remarkably similar mechanisms. B captures both the description and its significance.
- C
Examples of several mechanisms aren't a formal classification system. The account's emphasis is their contrast with later development, not arranging every mechanism into categories.
- D
The opening treats polarity as a requirement for development, but the discussion isn't an argument proving that requirement for all life forms. It explores differences in how that stage occurs.
- E
This also focuses on the opening requirement. The writer tells us that polarity must come first but does not explain why that necessity holds. The main work concerns varying mechanisms and the later similarity.
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