PrepTest 117, Section 1, Question 17
The survival of nerve cells, as well as(453 more words not shown)
The primary function of the(13 more words not shown)
- Aindicate that conclusions(12 more words not shown)
- Bindicate that conclusions(13 more words not shown)
- Cindicate ways in(14 more words not shown)
- Ddescribe subsequent discoveries(11 more words not shown)
- Eindicate that experimental(18 more words not shown)
Reading the passage
Paragraph two tells the discovery story: Levi-Montalcini investigates nerve growth and identifies NGF. Paragraph three expands on that result. Where is NGF found, how do nerves receive it, and what does it do? I'd predict an answer about developing our understanding of the discovery.
Working the answers
- A
The paragraph doesn't argue that the earlier conclusions still need verification. It reports what this work and subsequent research have established.
- B
No later evidence is presented as undermining the discovery.
- CCorrect
The opening reference to Levi-Montalcini's work and “other subsequent research” leads into fuller knowledge of NGF's distribution and roles. The discovery is supported and made more specific, which fits corroborated and refined.
- D
Other cell-growth factors are mentioned in the first sentence, but their discoveries aren't described. The rest of the paragraph explains NGF.
- E
No replacement for tissue culture is introduced. The focus is the substance and its effects, not newer experimental techniques.
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