Nhận biết (M1)

Genetic material passing from a parent to its offspring is vertical gene transfer; genetic material exchanged between organisms standing in no parent-offspring relation is horizontal gene transfer. Horizontal transfer is common in prokaryotes, the single-celled organisms that include bacteria such as Brevibacillus borstelensis and Lactococcus lactis, whereas in eukaryotes—that is, multicellular organisms—it has seldom been observed. New studies suggest, however, that horizontal gene transfer runs more common in eukaryotes than anyone first thought.

Which choice best states the function of the underlined sentence in the text as a whole?

• A.

  It draws a distinction between how two biological processes work.

• B.

  It contrasts how frequently a biological phenomenon has turned up in two different classes of organism.

• C.

  It explains why a widespread view of a biological process is mistaken.

• D.

  It claims that the two biological phenomena are more alike than they may at first seem.