肽链合成的延伸阶段不需要下列哪种物质()
A.GTP
B.转肽酶
C.蛋白质性质的因子
D.甲酰蛋氨酰-tRNA
E.mRNA
参考答案:D
A salty diet may increase the risk of stomach cancer ________ 10 percent, South Korean researchers found in a study of more than 2 million people.
A.at
B.to
C.by
D.for
GPRS采集终端支持的虚拟专网工作方式为()
A.永久在线
B.被动激活
C.永久在线及被动激活均可
D.以上答案均不正确