Penicillin is produced by what?
A form of mold
Yes, penicillin prevents the formation of new bacterial cell wall. If a bacteria reproduces, new cell wall cannot be produced and the cell lyses and dies. However penicillin has no effect on a quiescent (non-reproducing) bacteria. Therefore penicillin is also called a bacteriostatic agent (prevents growth of bacteria), which means penicillin does stop bacteria from reproducing.
Penicillin is produced by the Penicillium notatum fungi. Penicillin is one of the earliest discovered and widely used antibiotics. Antibiotics are natural substances that are released by bacteria and fungi into the their environment to inhibit the growth of other microbes, so it is biological warfare on a microscopic scale.
While the species itself is sensitive to penicillin, suffering significant reduction in population, the tetanus toxoid produced during bacterial metabolism is the causative agent of tetanus. Definitive treatment requires the administration of tetanus immune globulin to isolate and prevent the toxin from working within the body.