A) circular structures present in bacteria that contain genes encoding proteins and RNA and have the capacity to self-replicate and portion into daughter cells during cellular division. B) DNA elements that encode transposition and excision function and can transpose from one place on the chromosome to another. C) genetic elements capable of integrating resistance genes (cassettes) by an integron-encoded, site-specific recombinase. D) DNA elements found in bacteria that carry genes only for the enzymes needed to promote their own transposition. A) circular structures present in bacteria that contain genes encoding proteins and RNA and have the capacity to self-replicate and portion into daughter cells during cellular division. B) DNA elements that encode transposition and excision function and can transpose from one place on the chromosome to another. C) genetic elements capable of integrating resistance genes (cassettes) by an integron-encoded, site-specific recombinase. D) DNA elements found in bacteria that carry genes only for the enzymes needed to promote their own transposition.