动物脑组织中含有丰富的谷氨酸脱羧酶,能专一催化1 mol 谷氨酸分解为1 mol γ-氨基丁酸和1 mol CO2。某科研小组从小鼠的脑中得到该酶后,在谷氨酸起始浓
The professor gave orders that the test _______ before 10:30.A. will finishB. will be finished C. be finishedD. shall finish
已知命题p:x∈R,使x<4且x2+5x=24,则下列正确的是( )A.p是特称命题,p是真命题B.﹁p是全称命题,﹁p是真命题C.﹁p是特称命题,﹁p是真命题D.
已知(b-c)logmx+(c-a)logmy+(a-b)logmz=0且a,b,c构成公差不为零的等差数列,求证:x,y,z成等比数列.
下列关于染色体、DNA、基因三者的叙述中错误的是( )A. 每个DNA分子上只有一个基因 B.基因是有特定遗传效应的DNA片段C.DNA分子是
Sorry, we are late,--our plane was _____ because of the heavy rain. A. held out B. held on C. held up D. held back
(07成都市毕业班摸底测试)下列有关物种的叙述中,正确的是 ①不同种群的生物肯定不属于同一物种 ②物种是
某县法院对行政诉讼审理全面“提速”,依法判决“民告官”案,件件都当庭宣判,行政机关败诉率竟达到80%以上。这些案件没有一起被上级法院改判