作者superego (superego)
看板TransBioChem
标题[生物] campbell习题
时间Wed Dec 24 11:25:49 2008
细胞遗传学
1.At the end of telophase I of meiosisi and first cytokinesis ,
there are ________
(A)four haploid cells (B)two diploid cells
(C)four diploid cells (D)one haploid ovum and three polar bodies
(E)two haploid cells
ans(E)
Why?减数分裂末期一,答案不是应该是B吗?希望好心人士相救,谢谢
DNA复制
2若一段DNA长度约30um,此DNA属B型DNA,试问此段DNA含有多少bps?
ANS 88235bps
请问有人知道怎麽计算嘛?感激不尽
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 123.195.20.185
1F:推 ru0320011:同源染色体分开已经是单套,B型的1圈10.5个bps 12/24 23:29
2F:→ ru0320011:剩下的看课本自己算ˇˇ 12/24 23:29
3F:→ neveror:30*10^(-6)/3.4*10(-10) B型DNA的硷基距3.4埃 01/01 00:14
4F:→ neveror:应该是这样吧~ 01/01 00:15
5F:推 pcboy0831:Meiosis I ==> separation of homologous pairs 01/05 00:51
6F:→ pcboy0831:producing two haploid cells ... 01/05 00:51