紫外线辐射可引起DNA分子一条链上相邻嘧啶碱基之间形成二聚体,其中最容易形成二聚体的是
A.C—C
B.C—T
C.T—T
D.T—A
E.G—C
参考答案:C
膀胱肿瘤的好发部位最多为( )和( ),其次为( )和( )。
单词拼写(共10小题;每小题0.5分,满分5分)
根据下列句子及所给单词的首字母,在横线上写出各单词的正确形式。
1.I was b__________ by the dog yesterday.
2.He went through the forest under the p__________ of his dog.
3.Ancient people h__________ for food.
4.Geography a__________ people’s ways of living.
5.Orange juice c__________ vitamin.
6.They were so popular that their fans formed clubs ino order to get more f___with them.
7.The doctor is p__________ an operation now.
8.How much did you e__________ last month?
9.The flowers are s__________to temperature, so we must take good care of them.
10.He p___________ to be doing his homework when his mother came into his room.