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- Question
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
Options- A. nitrification
- B. denitrification
- C. nitrogen fixation
- D. ammonification
- Correct Answer
- denitrification
- 1. Marinated (sour pickled) fish should not have spoilage problems unless
Options- A. the acid content is very high
- B. the acid content is low enough
- C. the acid content is moderate
- D. none of the above Discuss
- 2. Which family has received most interest in their development as a biological control agent against insects?
Options- A. Reoviridae
- B. Baculoviridae
- C. Iridoviridae
- D. Poxviridae Discuss
- 3. Which of the following media is selective for Salmonella?
Options- A. Thiosulphate citrate bile salt agar
- B. Wilson and Blair's brilliant-green bismuth sulphite agar medium
- C. Bile salt agar
- D. All of the above Discuss
- 4. __________ is an environment like __________ where microorganisms are functioning in an extremely thin film of water and where oxygen-containing air is close to them.
Options- A. low oxygen diffusion environment; soils
- B. high oxygen diffusion environment; soils
- C. low oxygen diffusion environment; lakes
- D. high oxygen diffusion environment; lakes Discuss
- 5. Area of lysis on a bacterial lawn culture produced by a phage is known as
Options- A. pock
- B. plaque
- C. pox
- D. all of these Discuss
- 6. Which of the following antibiotics can't be used for treatment of infections with ?-lactamase-producing Staphylococcus aureus?
Options- A. Vancomycin
- B. Ampicillin/sulbactam
- C. Cephalothin
- D. Piperacillin Discuss
- 7. The reovirus and influenza virus contain
Options- A. 10 different segments of dsRNA and 8 different segments of ssRNA respectively
- B. 8 different segments of dsRNA and 10 different segments of ssRNA respectively
- C. 5 different segments of dsRNA and 7 different segments of ssRNA respectively
- D. 7 different segments of dsRNA and 5different segments of ssRNA respectively Discuss
- 8. Which of the following bacteria is gram-negative cocci?
Options- A. Veillonella
- B. Peptococcus
- C. Peptostreptococcus
- D. Sporosarcina Discuss
- 9. The growth of black-pigmented Bacillus nigrificans, a causative agent of black pickle is favoured by
Options- A. presence of carbohydrate like glucose
- B. low level of available nitrogen
- C. neutral or slightly alkaline brine
- D. all of the above Discuss
- 10. Cloudiness of brine of glass-packed olives may be caused by
Options- A. the lactics if fermentation of residual sugar resumes
- B. salt-tolerant bacteria
- C. film yeasts or moulds if air is available
- D. all of the above Discuss
More questions
Correct Answer: the acid content is low enough
Correct Answer: Baculoviridae
Correct Answer: Wilson and Blair's brilliant-green bismuth sulphite agar medium
Correct Answer: high oxygen diffusion environment; soils
Correct Answer: plaque
Correct Answer: Piperacillin
Correct Answer: 10 different segments of dsRNA and 8 different segments of ssRNA respectively
Correct Answer: Veillonella
Correct Answer: all of the above
Correct Answer: all of the above
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