Q. The antibiotic penicillin was discovered by which of the following researchers?

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Q. Which of the following antibiotic is not involved in inhibition of specific enzyme systems?

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Q. Bacterial cells grown in a medium exposed to high osmotic pressure, changes shape from rod-shaped to __________ shaped.

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Q. Cell-wall biosynthesis is inhibited by antibiotics by inhibiting the biosynthesis of which of the following ?

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Q. Structurally all penicillins have only beta-lactam present in them.

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Q. The crystalline sodium or potassium salts are slightly soluble in ___________

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Q. Which of the following does not affect the activity of penicillin?

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Q. Benzylpenicillin is the chemical name for which of the following penicillin?

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Q. Ampicillin is a bactericidal antibiotic.

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Q. Streptomyces orientalis produces which of the following antibiotics?

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Q. Which of the following interferes with regeneration of the monophosphate form of bactoprenol from the pyrophosphate form?

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Q. Polymyxins inhibits the growth of the microbes by carrying out which of the following actions?

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Q. Streptomycin is produced by which of the following organisms?

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Q. Antibiotic produced by Streptomyces rimosus is _______________

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Q. Which of the following inhibits protein synthesis by combining with the 50S subunit ribosome?

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Q. Tyrocidines are more effective against ___________________

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Q. Which of the following is the most accurate method for microbial assay of antibiotics?

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Q. The international unit of penicillin is defined by how much amount of International Standard?

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Q. Zone of inhibition is observed in tube-dilution method.

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Q. Pigs respond dramatically to the addition of which of the following antibiotics to their diet?

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