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Antibiotics Beginning of Paper have played a major role in our society thanks to Sir Alexander Fleming’s careful observations in 1928. Without it, many lives would be in danger due to infectious diseases. are chemical substances produced by various species of microorganisms and other living systems that are ca .... Middle of Paper .... can be bacteriostatic (bacteria stopped from multiplying) or bactericidal (bacteria killed). To perform either of these functions, antibiotics must be brought into contact with the bacteria. It is believed that antibiotics interfere with the surface of bacteria cells, causing a change in their ability to reproduce. Testing the action of an antibiotic in the laboratory shows how much exposure to the drug is necessary to halt reproduction or to kill the bacteria. Although a large amount of an antibiotic taken at one time might kill .... 1643 words | 6 pages Subscription Length Price Join 30 days membership (recurring) $19.95 90 days membership (recurring) $39.95 180 days membership (non-recurring) $69.95