【单选题】下列图中关于P、Q、R、S、G的描述,正确的是 [ ]
A.
P中存在着抗性基因,其非编码区通常不具有遗传效应
B.
Q表示限制性内切酶的作用,R表示RNA聚合酶的作用
D.
若要获得真核生物的S,则一般采用人工合成方法
【简答题】Business invitation letter ( 39 ) Lockwood Middle School 307 Main Street Lockwood, NJ 51686 December 10, 2008 President Lockwood Health Association 23 Main Street Lockwood, NJ Dear Mrs. Coling, My nam...
【判断题】无领导小组面试时,为避免自己犯错,可以尽量保持沉默。
【单选题】船舶制冷装置所用的冷凝器几乎都是______。
【单选题】140船舶制冷装置所用的冷凝器几乎都是 。
【简答题】Dear Benter, You have been away exactly two weeks today but it seems more like two years to me! I’m glad to hear you’ll be back soon . Are you coming directly home, dear? Or do you plan to m ake some ...