Read this excerpt from "DNA Testing."DNA samples from insects preserved in amber can date back to before the time of the dinosaurs, which died out 65 million years ago. George Poinar of Oregon State University, for example, has even extracted muscle tissue from a 125-million-year-old Lebanese weevil. This is, says Poinar, “the best preserved protein on the face of the earth.” So far, DNA has been successfully extracted from about a half dozen ancient samples in amber. Select the most accurate summary of Kaku’s argument.
Answer
A
Amber has allowed scientists to study DNA that has been preserved over millions of years.
B
Amber’s preservative uses have been studied and explained by scientists at Oregon State University.
C
Amber is an effective preservative for Lebanese weevils, as proven by ancient samples extracted by scientists.
D
Amber can preserve DNA over millions of years; this suggests a new method for preserving culture far into the future.
Explanation
The excerpt says scientists have extracted ancient biological material from insects preserved in amber, including tissue from a 125-million-year-old weevil, and that DNA has been recovered from several amber samples. Choice A captures that main point: amber has preserved material that lets scientists study ancient DNA. Choice D adds a claim about preserving culture into the future, which the excerpt does not support.
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