What is a R factor? A. A protein that can digest invasive DNA B. A section on a pathogen's chromosomal DNA that contains many virulent genes C. A plasmid that carries several genes contributes to the host bacteria's resistance to antibiotics, heavy metals, andior cellular taxins. D. A genetic element that's found on DNA that can enhance the expression of a bucterium's resistance genes Reser Selection Mark for Review What's This?.