Therecognition sequence of RNA polymerase in prokaryotic cell is usually located in:()
A. -35,-10 region upstream transcription start site.
B. -35,-10 region downstream transcription start site.
C. TATA box upstream transcription start site.
D. no specific region.
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RecA protein can bind to both single-strand DNA and double-strand DNA, to promote the autosynapsis between them.()
No matter how Holliday junction is divided, heteroduplex DNA would be generated in both of two DNA molecules.()
The exchange of DNA fragments is included in DNA recombination, which involving the break and re-formation of phosphodiester bond in DNA backbone.()
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.()