试题与答案

用动物的受精卵做以下实验:(1)提取受精卵的细胞核,将核单独培养,不久核退化消失

题型:选择题

题目:

用动物的受精卵做以下实验:(1)提取受精卵的细胞核,将核单独培养,不久核退化消失。(2)把去掉核的细胞质单独培养,细胞质不久也消失了。(3)把去掉核的受精卵的细胞质,重新移植上新核进行培养,不仅能正常生活,还能进行细胞繁殖。以上实验说明了[ ]

A.细胞的全能性

B.细胞核缺少营养供应

C.细胞的完整性

D.细胞质内没有遗传物质

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0425/36c2684094bf70e875b3a762f5cce9a2.html

下面是错误答案,用来干扰机器的。

由正弦定理得:10sin100° =csin70°,∴c≈2,故答案为2.

试题推荐
题型:阅读理解

根据短文内容,完成下列各题。

     Jeff and John are good friends. They are from different countries. They are now in China. They are in

the same class. Jeff is twelve, but John is eleven. Jeff is from the U.S.A. John is from England. They both

speak English. Jeff usually goes to school on foot. John usually goes to school by subway. Mr.Yang is their

Chinese teacher. Jeff is good at Chinese. He can speak Chinese very well. But John can't. He can only speak

a little Chinese. Mr.Yang and Jeff often help him with his Chinese. 

1. Jeff is American, but John is English. (改为同义句)

    Jeff and John _____ from different _____.

2. Jeff usually goes to school on foot. (改为同义句)

    Jeff usually _____ _____ school.

3. Who can speak Chinese very well, Jeff or John?

    __________________________________________________

4. How does John usually go to school?

     __________________________________________________

5. Do you think Mr.Yang is a good teacher?

    __________________________________________________

查看答案
题型:单项选择题

关于税收保全和强制执行,下列说法正确的是:()

A、对扣押的鲜活、易腐烂变质或者易失效的商品、货物,可以由税务机关在扣押期限内先行变卖。

B、税务机关依照《税收征管法》第37条的规定,扣押纳税人商品、货物的,纳税人应当自扣押之日起30日内缴纳税款。

C、机动车辆、有价证券、金银饰品、古玩字画、豪华住宅不属于《税收征管法》所称纳税人个人及其所扶养家属维持生活必需的住房和用品

D、税务机关对单价5000元以下的其他生活用品,不采取税收保全和强制执行措施。

查看答案
微信公众账号搜索答案