Multiple choice Which of the following organisms produce lantibiotics (class of peptide antibiotics)? Staphylococcus and Streptococcus Streptococcus and Streptomyces Bacillus and Streptomyces Penicillum and Streptomyces Reveal answer Fill a bubble to check yourself B Correct answer Explanation Streptococcus and Streptomyces produce lantibiotics. They are effective against other Gram-positive bacteria.