33. All of the following statements are true concerning F pili of E. coli EXCEPT a. male cells absorb phages onto two or three F pili . F pili are necessary for conjugation b c. fertility is lost when F pili are removed d. F pili fail to return on regrowth following removal by mechanical or cultural means e. F pili are formed again after removal 34. The homofermentative group of lactobacilli produces from sugar almost exclusively a. propionic acid b. carbon dioxide c. acetic acid d. ethanol e. lactic acid