PrepTest 155, Section 3, Question 22
This passage was adapted from an article published(449 more words not shown)
Which one of the following,(23 more words not shown)
- ABelcher and Hu's(22 more words not shown)
- BFor almost any(27 more words not shown)
- CThe number of(34 more words not shown)
- DThe one billion(28 more words not shown)
- EExpectations of continuing(32 more words not shown)
Reading the passage
What would help this become a usable technology? The team needs a range of peptides that can work with circuit materials. Evidence that their tools could accommodate the materials industry needs would help connect promising laboratory results with commercial production.
What we’re looking for
The question doesn't require proof that factories are already using the method. We want a fact that makes eventual practical use more likely.
Working the answers
- A
Renewed interest in DNA applications is interest in another approach. It doesn't show that the peptide tools can meet the practical requirements of commercial circuit construction. More scientific attention alone doesn't supply that connection.
- BCorrect
Suppose a circuit normally uses a semiconductor for which the team has no suitable peptide. If gallium arsenide can do the same job and an available peptide binds to it, the team can use gallium arsenide instead. Interchangeable materials give the researchers more ways to work around gaps in their toolkit. They don't have to find a peptide for every exact material currently used. That flexibility makes commercial application more plausible, even though it doesn't guarantee success.
- C
This compares the number of peptides that can bind two crystals simultaneously with the number that can bind them only separately. It doesn't show that the researchers have enough suitable simultaneous binders for the circuits they need. The numerical comparison doesn't make commercial use more likely.
- D
The relative sizes of the initial and later batches don't tell us whether their results can produce useful circuits. A smaller later batch could be productive or unproductive; counting candidates doesn't establish practical success.
- E
Continuing high costs and reduced interest in further research are obstacles. They make development and commercial use less promising rather than supplying the support we need.
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