皮皮学，免费搜题
登录
搜题
【单选题】
下列关于基因重组的说法不正确的是 [ ]A.
生物体进行有性生殖过程中控制不同性状基因的重新组合属于基因重组
B.
减数分裂四分体时期，同源染色体的姐妹染色单体之间的局部交换可导致基因重组
C.
乳酸菌和破伤风杆菌都不会发生基因重组
D.
一般情况下，水稻花药内可发生基因重组，而根尖则不能
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】决定颜色明亮程度的是颜色的那个属性 .
【简答题】CHECK约束被称为______约束,UNIQQUE约束被称为_______约束。
【单选题】It was ________ that I couldn’t finish it by myself. A. so difficult a work B. such a difficult work C. so difficult work D. such difficult work
A.
so difficult a work
B.
such a difficult work
C.
so difficult work
D.
such difficult work
【单选题】Of the two physics problems, Martha just finished ______ one. A. the most difficult B. the least difficult C. the less difficult
A.
the most difficult
B.
the least difficult
C.
the less difficult
【单选题】Do you think maths is _____ than English? [ ]
A.
difficult
B.
as difficult
C.
more difficult
D.
most difficult
【单选题】This text is ____ of the two. [ ]
A.
more difficult
B.
difficult
C.
the more difficult
D.
the most difficult
【单选题】I think Maths is ________ of all my subjects.
A.
much difficult one
B.
difficult one
C.
most difficult one
D.
the most difficult one
【简答题】UNIQUE约束被称为 约束。
【单选题】______, it was completed on time.
A.
Difficult as the task was
B.
Difficult as was the task
C.
As the task was difficult
D.
As was the task difficult
【简答题】CHECK 约束被称为 约束,UNIQUE约束被称为 约束。
相关题目：