Nhận biết (M1)

Lee Hsiang Liow and colleagues relied on historical DNA (hDNA)—genomic data incidentally preserved in specimens housed in collections such as those at the Smithsonian National Museum of Natural History—to investigate the evolutionary relationships between thirty-seven species of metazoans. Although this approach can yield many insights about the biological past, it remains a relatively underutilized resource in part because hDNA is often to some extent degraded, a situation not easily remediable under current methodological paradigms and with extant DNA extraction and analysis technologies.

Which choice best describes the overall structure of the text?

• A.

  It summarizes the findings of a scientific study, then discusses the possibility of other researchers replicating those findings in future studies.

• B.

  It exemplifies a common method of genomic data analysis, then details the difficulties in adapting that method to new circumstances.

• C.

  It presents a scientific study that relied on a particular approach, then describes a barrier to the widespread adoption of that approach.

• D.

  It evaluates a research methodology used in a particular study, then explains how scientists may overcome difficulties inherent to that methodology.