Lurking in colonies of pathogenic bacteria are drug-resistant mutants. If the colony is exposed to antibiotics, these resistant mutants may survive, but they still face...


Antibiotics, a vital tool for fighting infections, were originally products of nature—the first antibiotic was serendipitously discovered in mold contaminating a bacterial culture. As antibiotic...


In the early 1940s, many biologists doubted bacteria had genes. After all, they seemed to play by their own genetic rules: they appeared to lack chromosomes,...