科学家用美西螈(一种两栖动物)做实验,将黑色美西螈胚胎细胞的细胞核取出来,移植到白色

题型:单项选择题

问题:

科学家用美西螈(一种两栖动物)做实验,将黑色美西螈胚胎细胞的细胞核取出来,移植到白色美西螈的去核卵细胞中,由此发育成的美西螈,全部都是黑色的,这说明美西螈皮肤的颜色()

A.受细胞质控制

B.受核糖体控制

C.受细胞膜控制

D.受细胞核控制

考点:高中生物细胞的结构与功能细胞的结构与功能题库
题型:单项选择题

在java中,所有数据类型的长度都固定,因此没有保留字______。

题型:单项选择题

V.Spelling (5 points)

76. My grandpa is e______________ for sports, and he usually devotes half of his spare time to participating in various activities.

77. The s________ economic growth somewhat reflects the stability of the state.

78. She answered all my questions with her usual h________.

79. The money r______ by the singers was sent to the people in the flooded areas.

80. Showing t_________ is very important because it means that people will have fewer fights and argument.

81. My family were all _________ (反对) to spending the summer holiday in Shanghai.

82. It is like an underground city, ________ (占) an area of more than 20 football pitches.

83. It was built there so that _________(方便的) for everyone to get to

84. Some countries e________ to substitute their flags with tricolor flags, after the French.

85. People are becoming more and more a_______ of the need to preserve the world’s cultural heritage.

题型:单项选择题

铁路运输中,如发生事故,当事人应向铁路部门提交( )。

A.赔偿要求书

B.货物运单

C.货运记录

D.押运人记录

E.变更记录

题型:单项选择题

图示电路中,电流源的端电压U等于()V。

A.20

B.10

C.5

D.0

题型:单项选择题

下列()式空气流量传感器输出的是频率信号。

A.叶片式

B.热绒式

C.卡门旋涡式

更多题库