大学职业资格刷题搜题APP
创建自己的小题库
搜索
【单选题】
科学家在研究蚕豆根尖分生区细胞的有丝分裂周期时，分别用放射性同位素标记胸腺嘧啶脱氧核苷酸（）、标记尿嘧啶核苷酸（），把两种核苷酸被细胞利用的速率绘成曲线如图一所示。已知蚕豆根尖细胞有丝分裂周期为20h。培养20h后，根据细胞中的DNA相对含量不同，将细胞分为三组，每组的细胞数如图二所示。下列对结果的分析，不正确的是（）
A.
图一中处于ac段的细胞属于图二中甲组细胞，此时RNA聚合酶活性高
B.
图二中乙组细胞处于图一中ce段，此阶段细胞最容易发生基因突变
C.
图二丙组中只有部分细胞的细胞膜从中部向内凹陷
D.
蚕豆根尖细胞有丝分裂周期中，分裂期时间不超过6h
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈
收藏
举报
参考答案：
举一反三
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
extremes
B.
extracts
C.
terminals
D.
radicals
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
thus
B.
however
C.
so
D.
but
相关题目：
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
extremes
B.
extracts
C.
terminals
D.
radicals
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
thus
B.
however
C.
so
D.
but
参考解析：
题目纠错 0
发布
