Mechanisms by which antibioties kill or inhibit microbial growth are: a) Inhibit

Question

Mechanisms by which antibioties kill or inhibit microbial growth are: a) Inhibition of cell wall synthesis b) injury to cell membrane c) Inhibition of protein synthesis d) inhibition of DNA or RNA symtheis e) All of the above 2) The semisynthetic methicillin has the advantage of a) Being broad spectrum b) Being inactivated by penicillinase only on prolonged usage c) Not being affected by penicillinase d) All of the above e) None of the above 3) Which of the following interfere with cell wall synthesis a) Chloramphenicol b) Tetracyclines c) Penicillin d) Bacitracin e) Only C and D above 4) A rare but serious complication of chloramphenicol treatment is: a) Kidney damage b) Deafness due to damage to eighth cranial nerve c) Anemia due to suppression of bone marrow cells d) Anemia due to destruction of circulating red blood cells e) None of the above The development of drug resistance in a microorganism may be due to: a) Ability of the organism to destroy the antibiotic b) Mutation that allows the organism to by-pass the sensitive step c) Sporulation d) All of the above e) Only A and B above a) Commensalism. b) Symbiosis c) Opportunism Infection e) Symergestic effect

Explanation / Answer

All of the above Not being affected by penicillinase Penicillin and Bacitracin Anemia due to suppression of bone marrow cells Ability of the organism to destroy the antibiotic and mutation that allows the organism to by-pass the sensitive step symbiosis Nose, throat and skin intestine Epidemic antigen All of the above All of the above IgG All of the above Lymphocytes Temporary prevention of certain viral infections and neutrilization of certain potent bacterial toxin

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