关于基因、DNA和染色体,下列叙述错误的是 A.DNA是生物的主要遗传物质 B.

题型:选择题

问题:

关于基因、DNA和染色体,下列叙述错误的是

A.DNA是生物的主要遗传物质

B.染色体是由DNA和蛋白质组成

C.基因位于染色体上

D.基因是DNA分子的任意片段

考点:基因控制生物的性状
题型:选择题
给出下列四个函数:①f(x)=x+1,=2 ②f(x)=
1
x
,③f(x)=x2,④f(x)=sinx,其中在(0,+∞)是增函数的有(  )
A.0个B.1个C.2个D.3个
题型:选择题

用括号中所给词的适当形式填空。

1. John told us that his computer______ in Shenzhen. (make)

2. There were many people ______ for the train. (wait)

3. Name a-______ basketball organization in America, please. ( profession)

4. What about talking about the ______ between the Chinese and English names? (different)

5. The policeman said that he would try his best to catch the thief

    who matched miss brown's ______. (describe)

6. When she heard this, she was really very thrilled because she really wanted to get ______. (marry)

7. Zhang Shaohan's songs are ______ to the ear. (pleasure)

8. Henry set up a company that ______ (produce) microchips.

9. The work ______ tomorrow morning. (finish).

10. It's better ______ more exercise. (do)

题型:选择题

On the way to work, Natasha was surprised to find she was wearing a white earring on one ear

and a gray earring on ______. [ ]

A. another

B. the next

C. the other

D. the second

题型:选择题

一体格发育正常小儿,查体发现心尖区有柔和的Ⅱ级收缩期杂音,局限,受到呼吸体应、体位和运动影响。该小儿的杂音可见于:()

A.房间隔缺损

B.室间隔缺损

C.动脉导管未闭

D.肺动脉狭窄

E.生理性杂音

题型:选择题

星光镜的作用是什么?

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