Methods for post-translational regulation are still in their infancy, as a generalized system to control synthetic and endogenous proteins has not yet been reported. As synthetic systems have become larger and lesser complex, their interactions with endogenous systems have become more pronounced.
举一反三
- 丝绸时髦了，人造纤维过时了。 A: Silk is voguish and synthetic fibers are out. B: Silk has become voguish, synthetic fibers have become outdated. C: / D: /
- He _______ a league member for three years A: is B: has been C: has become D: have become
- As computer systems become even more __________, so too do the methods of those who exploit the technology. A: artificial B: logical C: simplified D: sophisticated
- They ____ friends since they met three years ago. A: became B: has been C: have become D: have been
- If the U.S. unemployment rate has increased, which of the following must have occurred? A: more workers have become discouraged and stopped looking for jobs B: more people have been forced to work in part-time rather than full-time jobs C: there has been an decrease in the work force as fewer job openings were listed D: more people have become only "marginally attached" to the work force E: none of the above