Bacteria can transfer genetic material, and thus drug resistance, to other bacteria via conjugation. Conjugation of the F Plasmid (McGraw-Hill)
Interesting Video/Animation Resources for undergraduated students:
MITOpenCourseWare 7.012: Introductory Biology
MITOpenCourseWare 7.013: Introductory Biology
MITOpenCourseWare 7.014: Introductory Biology.
Free Online MIT Courses - Biology