【单选题】Which one of the following statements concerning plasmids is true?
A.
All plasmids can be transferred between bacteria by conjugation
B.
Much of the information coded in the plasmid is essential to the survival of the bacteria cell.
C.
R plasmids carry genes for antibiotic resistance.
D.
R plasmids cannot be transferred to other bacterial cells
E.
Plasmids lack an origin of replication
【单选题】《尼伯龙根的指环》分为四夜,其顺序是:( )
【单选题】阅读以下程序,从键盘上输入abc,运行结果是( ) #include void main() { char ch; scanf("%3c",&ch); printf(“ ("%c ”,ch); }
【单选题】将相关系数及卡方检验应用于心理学与教育研究中的是