PrepTest 155, Section 3, Question 21
This passage was adapted from an article published(449 more words not shown)
The passage most strongly supports(5 more words not shown)
- ASome peptides that(9 more words not shown)
- BResearchers besides Belcher(17 more words not shown)
- CNeither Belcher nor(12 more words not shown)
- DSilicon, gallium arsenide,(17 more words not shown)
- EPeptides have been(10 more words not shown)
Reading the passage
We began with three test materials, but the research didn't stop there. The final paragraph says the team expanded its targets to 20 more semiconductor materials as its collection of useful peptides grew into the hundreds. Keep that development in mind while checking the answers. Specific claims about a particular pair of materials or about the researchers' entire careers still need their own support.
Working the answers
- A
Designing peptides that bind to two crystals doesn't establish that gallium arsenide and indium phosphide are one such pair. The account doesn't identify those two together. A general possibility doesn't verify a particular combination.
- B
Other work involving DNA is mentioned, but that doesn't establish another team's research into peptide-based circuit assembly. We aren't told that researchers outside this group have done that work.
- C
We learn about this project and Belcher's abalone research, not everything either scientist has ever studied. That limited account cannot establish that neither has done major research on other organic compounds.
- DCorrect
The search expands beyond silicon, gallium arsenide, and indium phosphide, and the collection of crystal-manipulating peptides grows with it. This supports the conclusion that the initial three aren't the only semiconductor materials to which peptides have been found to bind.
- E
The account doesn't identify an existing industrial use unrelated to semiconductors. A natural role in an abalone shell isn't an industrial application, and a possible future use in chips doesn't establish an earlier use elsewhere.
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