32. 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 nuclcoprotein filament (C) RecA monomers interact only with ssDNA and immediately dissociate when binding to dsDNA (D)RecA forms a tetramer that wraps aro und DNA at specific sites that must be cleaved by a nuclease (E)none of the above