【单选题】下图表示同一生物不同时期的细胞分裂图像(仅画出部分染色体),相关说法不正确的是( )
A.
图①的子细胞不可能是卵细胞;而非同源染色体自由组合发生在②的下一时期
B.
图②④所示过程仅发生在某些器官中,图②分裂后立即进入下一个细胞周期
C.
图③染色体、染色单体、核DNA之比为1∶2∶2,是观察染色体形态和数目最好的时期
D.
图④是减数第二次分裂的后期细胞,细胞分裂完成后将形成2个精细胞或第二极体
【简答题】单词拼写。 1. I received an i_____ the other day, but I didn't accept it. 2. At the good news, everyone was wild with joy and b_____ into laughter all at once. 3. I would a_____ it if you come to see me ev...
【单选题】下图是一种生物体的某个细胞示意图,据图判断,相关说法正确的是 [ ]
C.
此时细胞中染色体上的DNA分子不能进行转录和复制
【简答题】已知美元/日元=117.78;美元/加拿大元=1.1234,求加拿大元/日元=?
【单选题】It is negative to say the news is too good, but positive to say the news is too god.
【简答题】Listen to the news item 2 and choose the best answer to the following question. What can be learned about Elon Musk of Tesla Incorporated? ______ a. It was established in 2015. b. It is good at maki...
【单选题】在减数第二次分裂过程中不正确的说法是( )
【单选题】It is good news ______ they will arrive in a few days.
【判断题】电火花数控线切割加工适用于加工各种形状的冲模。