GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 033T5PWT4T4LXQ0YA
The macromolecule RNA is common to all living beings, and DNA, which is found in all organisms except some bacteria, is almost as ____________. A. mercurial B. amorphous C. ubiquitous D. manifest E. exiguous