克隆羊多莉的诞生可以证明()。A.细胞分化过程的稳定性 B.细胞质对细胞核基因韵表达

题型:多项选择题

问题:

克隆羊多莉的诞生可以证明()。

A.细胞分化过程的稳定性

B.细胞质对细胞核基因韵表达有调控作用

C.决定先于分化

D.动物体分化的体细胞的胞核具有发育的全能性

考点:生物学细胞基本知识细胞基本知识题库
题型:多项选择题

小红在探究“馒头在口腔中的变化”时,设计了如下实验方案:

试管编号ABC
馒头碎屑或块适量碎屑适量碎屑适量馒头块
试管中的加入物2mL唾液 2mL唾液
是否搅拌充分搅拌充分搅拌不搅拌
保温37℃水浴保温10分钟
加入碘液2滴
请分析回答:

(1)为了证明“唾液对馒头有消化作用”,在B号试管中应加入      ,与A号试管形成      

(2)为了证明“牙齿的咀嚼,舌的搅拌”对馒头有消化作用,应选用     两只试管进行对照实验。

(3)观察实验结果时,如果A号试管中加入碘液后溶液不变蓝,则原因是:A号试管中的淀粉被            酶全部分解成了         

题型:多项选择题

阅读理解

     Isaac Stern was more than a great violin player. He was one of the most honored musicians in the

world, an international cultural ambassador. And he was also a teacher and activist. For more than sixty

years, Mr. Stern performed excellent music. He performed in concerts around the world and on

recordings.

     Isaac Stern was born in 1920 in Ukraine. His parents moved to California the following year. He began

taking violin lessons after hearing a friend play the instrument. Later, he began studying music at the San

Francisco Conservatory(旧金山音乐学院). He progressed quickly. When he was sixteen, he played

with the San Francisco Symphony Orchestra. The next year, he performed in New York and was

praised by music critics.

     Isaac Stern became one of the busiest musicians of his day. He played more than one hundred

concerts a year. He also became one of the most recorded musicians in history. Isaac Stern also

supported artistic development and freedom.

     In 1979, Isaac Stern visited China. He met with Chinese musicians and students. He taught them

about classical Western music. His visit was made into a film. It is called From Mao to Mozart:Isaac

Stern in China. It won an Academy Award for best documentary film.

     In 1984, Isaac Stern received the Kennedy Center Honors Award for his gifts to American culture

through music. He expressed his thoughts about the part that music plays in life. He said music is an

important part of a civilized life. He said people need music as much as they need bread.

     Isaac Stern died in 2001 at the age of eighty-one. He was a major influence on music in the twentieth

century. He leaves the world richer with his many recordings.

1. What did Isaac Stern think of music?

A. Necessary.        

B. Difficult.

C. Entertaining.            

D. Interesting.

2. The passage mentioned Isaac Stern's visit to China mainly to ________.

A. encourage people to develop the international relationship

B. advise the readers to take up music

C. introduce more achievements of Isaac Stern

D. show he acted as an international cultural ambassador

3. Which of the following statements is TRUE about Isaac Stern?

A. He was born in California in the 1920s.

B. He had visited many countries to advertise his recordings.

C. He played less than one hundred concerts in all.

D. His excellent music life lasted over 60 years.

4. From the passage, we can infer that ________.

A. Isaac Stern influenced the culture in the 20th century a lot

B. Isaac Stern was one of the most active musicians of his day

C. Isaac Stern was so busy that he couldn't spare time to educate the youth

D. Isaac Stern led a rich life in his later life

5. What will be the best title for the passage?

A. Isaac Stern and the awards he got

B. Isaac Stern's life of pursuing music

C. Isaac Stern:one of the most honored musicians

D. Isaac Stern's visit to China

题型:多项选择题

关于开关传感器错误的描述是()。

A.分为电源侧和接地侧两种

B.无论是电源侧还是接地侧开关,在电脑内部均要用到限流电阻

C.电源侧开关输入的是电压信号,接地侧开关输入的是电流信号

D.以上全对

题型:多项选择题

商品经济是( )。

A.以自给自足为特征的经济形式
B.为他人而生产的经济形式
C.直接以交换为目的的经济形式
D.存在于一切社会的经济形式

题型:多项选择题

代发工资业务是指农业银行接受机关企事业单位和个体工商户委托,根据其提供的清单数据,代其发放职工()等款项的业务。

A.工资

B.奖金

C.福利费

D.养老金

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