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【判断题】
溴化乙锭(ethidium bromide)含有一个可以嵌入DNA或RNA的堆砌碱基之间的一个平面基团 与核酸结合后在紫外线激发下呈现荧光,荧光的位置代表核酸片段所在的位置。
A.
正确
B.
错误
举报
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】以下程序片段的运行结果是 。 int a=1; if (a++>1) printf( ” %d\n ” , a); else printf( ” %d\n ” , a--);
A.
0
B.
1
C.
2
D.
3
【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on (68) . Light gets through, ...
A.
from
B.
than
C.
as
D.
away
【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (62) our protective blanket on (63) . Light gets throug...
A.
[A] with [C] under
B.
[B] from [D] for
【单选题】下面哪个代码片段是错误的?( )
A.
package mypackage; public class Rectangel {//doing something...}
B.
import java.io.*; package mypackage; public class Rectangel {//doing something...
C.
import java.io.*; class Circle{//doing something} public class Rectangel {//doing something ...}
D.
import java.awt.*; import java.io.*;package mypackage; public class Rectangel {// doing something...}