Nester's Microbiology 8th Edition by Denise Anderson,Sarah Salm,Deborah Allen

Exercise 1

Antimicrobials are chemotherapeutic agents that are effective in treating microbial infections. Antibiotics are antimicrobial chemicals naturally produced by particular microorganisms. Pathogens develop resistance to antimicrobials, so scientists must continually create new varieties.
How is the microbe that makes penicillin different from the one that makes streptomycin?