Microbiology Chapter 20 Exam Questions with 100% Correct Answers | Verified | Updated

Microbiology Chapter 20 Exam Questions with 100% Correct Answers | Verified | Updated One of the earliest researchers to explore the use of chemicals to kill microbial pathogens was Koch. Hooke. Fleming. Ehrlich. - answer✔✔Ehrlich The arsenic compound that proved highly effective in treating syphilis was called penicillin. sulfa. erythromycin. Salvarsan - answer✔✔Salvarsan The first example of an antimicrobial drug synthesized in the laboratory was penicillin. sulfa. erythr omycin. Salvarsan. - answer✔✔Salvarsan Prontosil effectively acted on streptococci when the drug was split by enzymes to produce penicillin. sulfanilamide. erythromycin. Salvarsan. - answer✔✔sulfanilamide. The use of Salvarsan and Prontosil to treat microbial infections were early examples of antibiotics. toxins. inhibitors. chemotherapy. - answer✔✔chemotherapy. Penicillin was discovered by Koch. Hooke. Fleming. Ehrlich. - answer✔✔Fleming The most effective form of penicillin is A. B. E. G. - answer✔✔G One of the earliest antimicrobials isolated from a bacterium was penicillin. ampicillin. Salvarsan. streptomycin. - answer✔✔streptomycin Which of the following groups of microorganisms produces antibiotics? a. Penicillium b. Streptom yces c. Bacillus d. All of the choices are correct. e. Penicillium AND Streptomyces - answer✔✔All of the choices are correct An antibiotic made by microorganisms and modified by chemists is called anti-metabolic. catabolic. synthetic. semi -synthet ic. - answer✔✔semi -synthetic The antimicrobials produced by some molds and bacteria are generally called insecticides. biocides. antiseptics. antibiotics. - answer✔✔antibiotics The toxicity of a given drug is expressed as the selective toxicity. biocide index. biostatic index.