Penicillin is a mould (a type of fungus) but it can be used as an __________. It prevents bacterial amino acids from forming. It only affects bacterial cells and would be of no benefit when treating __________ or __________ infections.
Penicillin is a bactericidal. It kills the pathogens directly. Bacteriostatic antibiotics prevent the pathogen from reproducing.
The use of antibiotics is on the increase. Some bacteria have __________ and become __________ to the antibiotic. There are a limited number of antibiotics known to man and this could cause problems in the future.
This happens when antibiotics are not used for whole course. This leaves some very strong bacteria left alive which multiply up, worsen the infection and are very hard to treat.