Four steps are involved in most of DNA repairs. The correct order of the four steps is:()
A. recognition、excision、re-synthesis、re-ligation
B. re-ligation、re-synthesis、excision、recognition
C. excision、re-synthesis、re-ligation、recognition
D. recognition、re-synthesis、re-ligation、excision
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In photoreactivation repair, which of the following enzyme binds to pyrimidine dimer?()
A. Photolyase
B. Exonuclease
C. Endonuclease
D. Ligase
Which enzyme is not needed during base excision repair:()
A. DNA polymerase
B. Phosphodiesterase
C. Exonuclease
D. Ligase
E. Glycosylase
The DNA strand containing pyrimidine dimer can still functions as a template during replication. When replication fork meets damaged site, the synthesis of nascent strand will be completed by which of the following enzyme:()
A. DNA polymerase I
B. DNA polymerase III
C. RecA
Damage-removing synthase
The UvrAB complex in E.coli can recognize:()
A. Gaps between Okazaki fragments
B. Normal DNA molecule
C. Hemi-methylated GATC
D. Twisty DNA double helix