How does RecA bring about strand exchange?
A) RecA acts as a helicase, unwinding DNA in localized regions
B) RecA monomers bind to ssDNA to form a nucleoprotein filament
C) RecA monomers interact only with ssDNA and immediately dissociate when binding to dsDNA
D) RecA forms a tetramer that wraps around DNA at specific sites that must be cleaved by a nuclease
E) none of the above
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