Which one of the following statements about the damage of UV to DNA of living cells is not true?()
A. Damage prevents normal DNA replicating
B. The most damaging wavelength is 260nm
C. To form a covalent bond between adjacent pyrimidines
D. The phosphodiester bond between adjacent nucleotides is broken
E. Most cells can synthesize proteins to repair UV damage
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Among the operons with weak regulation, the mutation that causes the overexpression of the product gene is most likely to occur in()?
A. operatorgene
B. RNA 3 'terminal sequence
C. RNA 5 'terminal sequence
D. RNA intron
E. Coding genes of trans-acting element
What can be used when an oligonucleotide containing a damaged base is produced in a cell?()
A. Photoreactivation repair
B. Excision repair
C. Recombination repair
D. SOS repair
E. Mismatch repair
Which one of the following repair processes is used to determine the chain to be repaired depending on the methylation state of the chain?()
A. Photoreactivation repair
B. Excision repair
C. Recombination repair
D. SOS repair
E. Mismatch repair
Which following repair methods is usually introduced gene mutation?()
A. Photoreactivation repair
B. Excision repair
C. Recombination repair
D. SOS repair
E. Mismatch repair
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