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【单选题】
射线对造血系统的损伤主要发生在( )。A.
成熟红细胞
B.
成熟白细胞
C.
造血干细胞
D.
外白细胞
E.
网织红细胞
F.
白细胞
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举一反三
【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】Which of the following statements about genetic exchange in bacteria is NOT true?
A.
In conjugation there has to be a physical connection between the donor cell and the recipient cell.
B.
Plasmids do not have to integrate into the host cell chromosome in order to be replicated.
C.
Interrupted conjugation results in the production of Hfr strains.
D.
The order of gene transfer is not the same for different Hfr strains.
E.
Antibiotic resistance can be transferred from one bacterial cell to another by conjugation.
【简答题】灭菌后的无菌包有效期为____天。
【单选题】《尼伯龙根的指环》分为四夜,其顺序是:( )
A.
莱茵的黄金、女武神、齐格弗里德、诸神的黄昏
B.
女武神、莱茵的黄金、齐格弗里德、诸神的黄昏
C.
莱茵的黄金、齐格弗里德、女武神、诸神的黄昏
D.
莱茵的黄金、女武神、诸神的黄昏、齐格弗里德
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