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【简答题】

为什么要开展黄牛杂交改良?

题目标签:杂交黄牛牛杂
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参考答案:
参考解析:
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刷刷题刷刷变学霸
举一反三

【单选题】当F+×F-杂交时:( )

A.
F因子几乎总不转移到F+细胞中
B.
F-菌株几乎总是成为F+
C.
基因重组的发生频率较高
D.
F因子经常插入到F-细胞染色体上

【单选题】Southern杂交通常是指()。

A.
DNA和RNA杂交
B.
DNA和DNA杂交
C.
RNA和RNA杂交
D.
蛋白质和蛋白质杂交
E.
DNA和蛋白质杂交

【单选题】In the 1920s demand for American farm products fell, as European countries began to recover from World War I and instituted austerity (紧缩) programs to reduce their imports. The result was a sharp drop...

A.
might cause greater scarcity of farm products
B.
didn't give the Secretary of Agriculture enough power
C.
would benefit neither the government nor the farmers
D.
benefited one group of citizens at the expense of others

【单选题】当F+×F-杂交是下列说法对的是( )

A.
F因子几乎总不转移到F+细胞中
B.
F- 菌株几乎总成为F+
C.
基因重组的发生频率较高
D.
F因子经常插入到F-细胞染色体上

【单选题】甲将走失的黄牛一头带回家饲养,两个月后以1200元卖给乙,后丙认出是他的牛,向乙追索,则( )。

A.
牛归丙所有,丙付1200元给乙
B.
牛归乙所有,甲向丙付1200元
C.
牛归丙所有,甲退还乙1200元,丙向甲偿付饲养黄牛两个月的费用
D.
牛归乙所有,甲向丙付1200元,但应扣除其饲养黄牛两个月的费用
相关题目:
【单选题】当F+×F-杂交时:( )
A.
F因子几乎总不转移到F+细胞中
B.
F-菌株几乎总是成为F+
C.
基因重组的发生频率较高
D.
F因子经常插入到F-细胞染色体上
【单选题】Southern杂交通常是指()。
A.
DNA和RNA杂交
B.
DNA和DNA杂交
C.
RNA和RNA杂交
D.
蛋白质和蛋白质杂交
E.
DNA和蛋白质杂交
【单选题】In the 1920s demand for American farm products fell, as European countries began to recover from World War I and instituted austerity (紧缩) programs to reduce their imports. The result was a sharp drop...
A.
might cause greater scarcity of farm products
B.
didn't give the Secretary of Agriculture enough power
C.
would benefit neither the government nor the farmers
D.
benefited one group of citizens at the expense of others
【单选题】当F+×F-杂交是下列说法对的是( )
A.
F因子几乎总不转移到F+细胞中
B.
F- 菌株几乎总成为F+
C.
基因重组的发生频率较高
D.
F因子经常插入到F-细胞染色体上
【单选题】甲将走失的黄牛一头带回家饲养,两个月后以1200元卖给乙,后丙认出是他的牛,向乙追索,则( )。
A.
牛归丙所有,丙付1200元给乙
B.
牛归乙所有,甲向丙付1200元
C.
牛归丙所有,甲退还乙1200元,丙向甲偿付饲养黄牛两个月的费用
D.
牛归乙所有,甲向丙付1200元,但应扣除其饲养黄牛两个月的费用