Drug resistance is not transmitted by -

Factor: The F factor is a tramsfer factor that contains the genetic information necessary for the synthesis of sex pilus and for self-transfer but is devoid of other identifiable genetic markers such as drug resistance. Cells carrying the F factor have no distinguishing feature other than their ability to mate with F - cells and render them F+. The F factor is actually an episode and has the ability to exist in some cells in the integrated data or inseed into the host chromosome; such cells are able to transfer the chromosomal gene to recipient cells with high frequency and are known as Hfr cells. Following conjugation with an Hfr cell an F- only rarely becomes F+ though it receives chromosomal genes from the donors. REF:Ananthanarayan and Panicker's Textbook ofMicrobiology 8thEdition pg no:65