30. Which of the following describes the Holliday junction?
(A)point where DNA base excision repair initiates
(B)crossover point involving 4-stranded DNA structure in homologous recombination
(C) insertion point of a gene flanked in transposons
(D)point where MutS binds to initiate SOS response
(E)none of the above
阿摩線上測驗
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