质粒
参考答案:
细菌细胞内一种自我复制的环状双链DNA分子。能稳定地独立存在于染色体外,并传递到子代,一般不整合到宿主染色体上。常含抗生素抗性基因,是重组DNA技术中重要的工具。
词组(共10小题;每题1分,满分10分; 每空1词。)
小题1: Her name is Alex, _______ _______ (缩写) Alexandra.
小题2:He gave the speech _______ _______ _______ (不看)his notes.
小题3: I’m afraid you’re not _______ _______ _______ (取得很大进步) in your study.
小题4:Many people went to countryside at weekends to _______ _______ _______ (逃避摆脱) the city noise.
小题5:She was _______ _______ _______ _______ (盼望看到) the grandchildren again.
小题6: He bothered me with _______ _______ _______ (许多) questions.
小题7:The dresses on sale in this department store are _______ _______ _______ (过时的) .
小题8:They try to avoid _______ _______ (修建) the new school buildings next to the highway.
小题9: As soon as his head hit the pillow, he _______ _______ (睡着了).
小题10: After World WarⅡ, Germany _______ _______ _______ (被分成) two separate countries.
对于CISC指令集结构,增强机器的指令功能,可以面向目标程序增强指令功能。面向目标程序增强指令功能主要利用如下一些方法:提高运算型指令功能、()、()。