Final answer:
RecA plays a crucial role in repairing double-stranded DNA breaks through homologous recombination. It forms a nucleoprotein filament that searches for homologous sequences and binds to them, enabling accurate repair without DNA deletions or insertions.
Step-by-step explanation:
The function of RecA in the SOS response pathway is to repair double-stranded DNA breaks through a process called homologous recombination. When a break occurs, RecA proteins bind to single-stranded DNA, forming a nucleoprotein filament. The filament then searches for homologous sequences on the opposite DNA strand and binds to them. The invading DNA strand is used as a template for repair, resulting in accurate DNA repair without deletions or insertions.