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RecA protein can bind to both single-strand DNA and double-strand DNA, to promote the autosynapsis between them.()

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No matter how Holliday junction is divided, heteroduplex DNA would be generated in both of two DNA molecules.()

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The exchange of DNA fragments is included in DNA recombination, which involving the break and re-formation of phosphodiester bond in DNA backbone.()

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RecA protein is a sequence-specific endonuclease that acts on single strand, as well as a helicase that can dissociate single-strand DNA from double helix, the latter of which is ATP-dependent.()

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What are the common characteristics of nucleotide excision repair and homologous recombination repair:()

A. The endonuclease is needed to cut one strand of DNA molecule.
B. The dysfunction of DNA caused by pyrimidine dimer can be avoided.
C. DNA polymerase is needed to synthetize single-strand DNA, repairing gaps in DNA strands.
D. Ligase is needed to make covalent bond between new fragment and the old one.

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