【单选题】Which DNA polymerase is most responsible for chain elongation in E. coli?
【多选题】E. coli经紫外线照射引起DNA损伤时
【简答题】LD有()种同工酶,分别由()种不同的亚基构成四聚体。
【单选题】The b subunit of E. coli DNA polymerase III holoenzyme
A.
unwinds DNA ahead of the replication fork .
B.
does the 3′ → 5′ editing .
C.
repairs single strand nicks in DNA .
D.
is the essential processivity factor .
【单选题】Which E. coli DNA polymerase has the ability to“proofread” newly synthesized DNA and remove erroneous bases?
B.
DNA polymerase III only
C.
DNA polymerase I and III
D.
all three DNA polymerases have proofreading ability
【多选题】下列关于λ DNA重组体导入E. coli,说法正确的是( )
A.
λ DNA重组体必须有效包装后才能有感染E. coli的活性
B.
λ DNA重组体是以双链环状形式导入E. coli
C.
λ DNA重组体包装要有头部蛋白、尾部蛋白的参与
【单选题】单线一切电话中断,优先发车站没有待发列 车时,应主动用( )通知非优先发车的车站。
【判断题】DNA polymerase III is the largest DNA polymerase in E. coli.