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【单选题】
引起一半动物有效反应的量是A.
阈剂量
B.
效能
C.
效价强度
D.
治疗量
E.
ED 50
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举一反三
【单选题】下列经济业务中，不可能发生的是（ ）。
A.
一项资产减少、一项负债等额减少的经济业务
B.
一项负债增加、另一项负债等额减少的经济业务
C.
一项负债增加、一项所有者权益等额增加的经济业务
D.
一项资产增加、一项所有者权益等额增加的经济业务
【单选题】A prophage is an early stage in the development of a/an
A.
bacterial virus
B.
poxvirus
C.
lytic virus
D.
enveloped virus
【单选题】Pieces of plasmid or bacterial chromosomal DNA may be mistakenly packaged into the capsid (head) of a bacterial virus. Assuming that no prophage state has existed in the phage production, what is the ...
A.
Conjugation
B.
Lysogeny
C.
Generalized transduction
D.
Specialized transduction
E.
Transformation
【单选题】Choose the correct statement with respect to lysogen and prophage.
A.
The integrated phage is called as lysogen
B.
The infected bacterial cell is called a prophage
C.
If there is only growth of few lysogens, the E. coli lawn would be turbid
D.
If lysogens won’t be formed, the plaques won’t be clear
【单选题】The prophage is ( ) two new att sites, the products of the recombination, called attL and attR.
A.
bind to
B.
bound by
C.
bounded by
D.
bound to
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