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 _____________

Bacteria are likely to be more prevalent in soils of vineyards, orchards and apiaries.

Ammonia oxidizers and nitrite oxidizers are ______________

Alanine gives pyruvic acid on deamination.

How much time does nitrifying bacteria require to grow at an incubation of 250 to 300 C?

Nitrosococcus nitrosus is a nitrite-oxidizing bacteria.

Which among the following is not an ammonia-oxidizing bacteria?

Agrobacterium is involved in which of the following processes?

Which of the following is symbiotic nitrogen fixing bacteria?

Which among the following are the most important agents for carbon dioxide fixation?

Fresh air contains approximately ______ percent carbon dioxide by volume.