6.
下图是某种生物的精子细胞,根据图中染色体类型和数目,则来自同一个次级精母细胞的是( )
A.①③ B.②⑤ C.①④ D.③④
5.肺炎双球菌中的S型具有多糖类荚膜,R型则没有。下列叙述错误的是( )
A.培养R型活细菌时加S型细菌的多糖类物质,能够产生一些具有荚膜的细菌
B.培养R型活细菌时加S型细菌DNA的完全水解产物,不能产生具有荚膜的细菌
C.培养R型活细菌时加S型细菌DNA,能够产生具有荚膜的细菌
D.培养R型活细菌时加S型细菌的蛋白质,不能产生具有荚膜的细菌
4.在某双链DNA分子的所有碱基中,鸟嘌呤的分子数占30%,则胸腺嘧啶的分子数占( )
A.10% B.20% C.30% D.40%
3.染色体复制后,一条染色体上含有2个染色单体。此时一条染色体上具有( )
A.2个单链DNA分子 B.1个双链DNA分子
C.2个双链DNA分子 D.4个单链DNA分子
2.下图示DNA转录过程中的一段,其中核苷酸的种类是 ( )
-G-C-T- A-
| | | |
-C-G-A-U-
A.4种 B.5种 C.6种 D.8种
1.为区分噬菌体的蛋白质与核酸,应选用放射性同位素标记蛋白质中的 ( )
A.N B.P C.S D.O
4.一些习惯说法使用倒装语序。
How goes it with you 你好吗?
What care I 管我什么事?
What matters it 这有什么关系?
口诀
副词开头要倒装,人称代词则如常。
only修饰副介状,位于句首半倒装。
否定意义副连词,即“不……也不”需倒装。
such代词做表语,引起主谓要倒装。
Not only开头句,前一分句须倒装。
had, were, should虚拟句,省略if半倒装。
3.As/though 引导的让步状语从句中的倒装
①表语提前,构成倒装。
Though she is very pretty, she is not clever.
→ Pretty though she is, she is not clever.虽然她很漂亮,但是她不聪明。
Although it may appear strange, it is true.
→ Disabled as he was, he tried his best to serve the people. 虽然他残疾了,但他仍尽力为人民服务。
Although he is a child, he speaks fluent English.
→ Child as he is, he speaks fluent English. 虽然他是个孩子,但能讲流利的英语。 (名词单数前不用不定冠词a)
Though he is the shortest, he is the richest of the three.
→ Shortest as he is, he is the richest of the three. 虽然他是三个人中最矮的,却是最富有的。(形容词最高级前去定冠词the)
②动词提前,构成倒装。
Though they searched, they could not find anything in the house.
→ Search as they did , they could not find anything in the house. 虽然他们搜遍了, 却没在房子里找到任何东西。
Though I failed, I would try again.
→ Fail as I did, I would try again. 尽管我失败了,但我还要再试。
Though she may try again, she won't pass it.
Try as she may, she won't pass it. 尽管愿意再试,她还是不会通过的。
③副词提前,构成倒装。
Though he tried hard, he couldn't pass the exam.
→ Hard as he tried, he couldn't pass the exam. 尽管他努力了,他还没有通过考试。
Though I listened attentively, I still couldn't understand what he said at the meeting.
→ Attentively as I listened, I still couldn't understand what he said at the meeting. 尽管我专心听了,我还是不懂他在会议上说的话。
Though he ran the fastest, he still didn't catch the train.
→ Fastest as he ran, he still didn't catch the train. 尽管他跑得最快,仍没有赶上火车。(副词最高级前不用定冠词the)
2.the ...more... the more ...结构中的倒装
The harder you work, the happier you feel. 你越努力工作,就越觉得快乐。(表语提前)
The more you study, the more you know. 你学得越多,就明白越多。(宾语提前)
提示:
有时从句倒装,主句不倒装。
I like the painting better the more I look at it. 我越看这幅画,就越喜欢它。
1.宾语位于句首表示强调
The past one can know, but the future one can only feel. 一个人可以明知过去,但只能感悟未来。
What Julia did I cannot imagine. 我想象不出朱莉娅做了什么。
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