题目内容

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

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Which of the following regarding to DNA repair is NOT correct:()

A. UV irradiation can induce crosslinking between the adjacent thymines
B. DNA polymerase III is needed in the nucleotide excision repair system to repair the nick of single strand.
C. DNA repairing process needs DNA ligase
D. Specific damaged bases can be removed by different glycosylase in the mammal cells.

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Nitrite is a common food additives. Itself as well as the nitrosamine generated by heating reaction of nitrite with amino acid are both mutagenic agents of DNA.()

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In the process of depurination sites repairing and nucleotide excision repairing, the glycosidase is needed to catalyze the ligation of correct bases to pentose.()

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The oxidative damage of bases in DNA can occur spontaneously.()

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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

Which of the following regarding to DNA repair is NOT correct:()

Nitrite is a common food additives. Itself as well as the nitrosamine generated by heating reaction of nitrite with amino acid are both mutagenic agents of DNA.()

In the process of depurination sites repairing and nucleotide excision repairing, the glycosidase is needed to catalyze the ligation of correct bases to pentose.()

The oxidative damage of bases in DNA can occur spontaneously.()

A. Gaps between Okazaki fragments
B. Normal DNA molecule
C. Hemi-methylated GATC
D. Twisty DNA double helix