Sulfonamides and arsphenamine are similar in their specificity for a special group of organism.

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

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

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

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

Ampicillin is a bactericidal antibiotic.

Streptomyces orientalis produces which of the following antibiotics?

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

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

Streptomycin is produced by which of the following organisms?

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

Nystatin is produced from the strain _____________________

Griseofulvin is useful in the therapy of nonsystemic fungal infections.

Acycloguanosine is a nucleoside analog which is active against ___________________

Which of the following has its antiviral action attributed to the interference of protein synthesis?

Which of the following is effective in the control of tuberculosis in humans?

The association which involves the exchange of nutrients between two species is referred to as ______________

Fungi produces which of the following inhibitory toxic product?

Which of the following comes under the category of positive association?

Parasitism results from competition among organisms for essential nutrients.

The dominant mineral particles in most soils are compounds of _____________