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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. Ampicillin is a bactericidal antibiotic.

View solution

Q. Streptomyces orientalis produces which of the following antibiotics?

View solution

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

View solution

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

View solution

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

View solution

Q. Antibiotic produced by Streptomyces rimosus is _______________

View solution

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

View solution

Q. Tyrocidines are more effective against ___________________

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. Which of the following antibiotic have a sparing effect on the B12 in the diet?

View solution

Q. Antibiotics are not effective against plant pathogens.

View solution