如图所示,两个核酸片段在适宜条件下,经X酶的催化作用,发生下述变化,则X酶是
A.DNA连接酶
B.RNA聚合酶
C.DNA聚合酶
D.限制酶
答案:A
在横线上填上恰当的词,完成下列疑问句。
1. ______________ there a picture in Jack's room?
2. ______________ they want to go to Hong Kong?
3. ______________ I play football this afternoon?
4. — ______________ does Mary go to school? — On foot.
5. — ______________ grade are you in? — I'm in Grade 2.
6. — ______________ is this coat? — 100 yuan.
7. — ______________ is this shirt? Is it Ann's? — No, it isn't. It's Lily's.
8. — ______________ is your dress? — It's white.
男性患者,56岁,突然出现左手活动不灵, 30min后自行好转,完全恢复正常,该患者最可能的诊断是
A.TIA
B.癫癎
C.脑梗死
D.瘤卒中
E.脑出血