Subscription pricing
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
███ ███████ ████ ███ ██ █████████ ████████ ████████ ██ ████████ ███ ████████ █████ ██████████ ██ ███ █████████ ████ █ ████████ ███████ ██████ ███████ █████████ ██ ███████████ ████ ███ █████████ █████ ████ ██ ███ █████ ███████ ██████ ████ ████ ██████████ ███████ ███ ███ █████████ ████████████ ███████ ██ ███ █████ ████████ ████ ██ ████ █████ ████████ ████ ██ ██████ ███ ███████ ██████ ██ ███ █████████████ █████████ ████ ████ ████████████ ████ █████ ████ █ ████ ███ ████████ █████████ ████████████ ███
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
██ ████ ████ ██ █████ ██ ███ ████ █ ██████ ██ ████████ █ ███ ██ ████████████████ █████ ██ █████ ██ █████████ ██ ████████ ████ ██████████ ███████ █████████ ████ ████ ██ █████████████████ ██████████ ███ █████ ██ ██████ ████████ ██ ████ ██████ ██ ████ ████ ████████ █████ ███████ ██ ██ ████ █████████████ ██████████ █████ █████ ██ ████████████████████ ████████ ███ █████████ ████ ███ █████████ ████ ███ ████ █████████ ███ ████████ ████ ████ ██ ███ █████████ ████████ ██ █████ ██████ ██ █ ████ ██ █████ ██ ████ ████
Future research ·
Identifying additional organic compounds that can bind to additional semiconductor mateirals
Passage Style
Problem-analysis
Single position
21.
The passage most strongly supports █████ ███ ██ ███ ██████████
a
Some peptides that ████ ██ ███████ ████████ ████ ████ ██ ██████ ██████████
b
Researchers besides Belcher ███ ██ ███ █████ ██████████ ████ ███████ ███ ███████████ ██ █████ ████████ ██ ███ ████████ ██ █████████████
c
Neither Belcher nor ██ ███ ████ █████ ██████████ ████████ ██ ███████ █████████ █████ ████ █████████
d
Silicon, gallium arsenide, ███ ██████ █████████ ███ ███ ███ ████ █████████████ █████████ ██ █████ ████████ ████ ████ █████ ██ █████
e
Peptides have been ████ ██ ██████████ ████████████ ████ ███ ███ ███████ ██ ███████████████