题目内容

In prokaryotic cell,the main function of protein RecA in genetic recombination is:()

A. To promote the autosynapsis and single-strand exchange between DNA molecules
B. To disassociate the single strand from the duplex DNA molecule
C. Possessing activity of cutting the single strand DNA at specific site
D. To promote the formation of the single strand DNA

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Which of the following repair cannot fundamentally eliminate DNA structural damage:()

A. nucleotide excision repair
B. mismatch repair
C. photoreactivation repair
D. recombination repair

Nucleotide excision repair system is similar with mismatch system in replication process, both of which recognize the twisty DNA double helix as damaged site. So the same protein complex can be used to find damaged sites in these two system.()

The depurination sites of DNA strand can be repaired by directly addition of bases to pentose by specific glycosylase based on complementary base pairing.()

The prokaryotic cell is susceptible to environment and DNA damage can be easily generated, therefore its damage-removing synthase is actively expressed as a result of transcriptional activation of RecA.()