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passage 3
This passage was adapted from an article published in 2000.
P1
Problem ·
Computer chips will hit a point where they can't be made any smaller
With current methods, transistors (devices that make up computer chips) cannot be made smaller than 25 nanometers.
Potential solution ·
Natural chemical processes might produce smaller molecules that act like transistors
Belcher and Hu ·
B and H are investigating peptides
Others are researching DNA to try to create small transistor-like molecules. B and H are researching something else -- peptides.
P2
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Background leading to research ·
Arose from research that found peptides could cause calcium carbonate to form structure found in abalone shell
B and H thought peptides might create crystalline structures associated with transistors.
B and H's research ·
Grew a billion different peptides, found that some can bind to semiconductor materials
P3
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Future research ·
Identifying additional organic compounds that can bind to additional semiconductor mateirals
Passage Style
Problem-analysis
Single position
20.
The primary role of
a
why research of ███ ████ ████ ██ ███████ ███ ██ ███ ███ ██████████ ██████████ ██ █████ ███████████
b
the purpose and ██████████ ██ ███ ████████ ████ ███████ ███ ██ ████ ██████████
c
the skepticism with █████ ████ ███████ ██ ███ ██████████ █████████ ████ ███████ ███████ ███ ████ ████████
d
a commonly held █████████ ███████ █████ ███████ ███ ████ ████████ ██ ████████
e
a hypothesis that ███████ ███ ████ ████████ ██ ████████ ██ ████