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- Question
For the selection of endospore-forming bacteria, a mixed culture can be heated at
Options- A. 80°C for 10 minutes
- B. 70°C for 10 minutes
- C. 60°C for 10 minutes
- D. 90°C for 10 minutes
- Correct Answer
- 80°C for 10 minutes
- 1. The viral DNA of the temperate phage, instead of taking over the functions of the cell's genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens in
Options- A. lysogeny
- B. spontaneous induction
- C. lytic phase
- D. none of these Discuss
- 2. Black rots in eggs is most commonly caused by
Options- A. species of Proteus
- B. species of Micrococcus or Bacillus
- C. molds or yeasts
- D. all of these Discuss
- 3. High acid foods with a pH < 3.7 undergo spoilage by
Options- A. Saccharolytic anaerobe
- B. B. coagulans
- C. both (a) and (b)
- D. do not undergo spoilage by microorganisms Discuss
- 4. Organisms which have spore-forming stage in their life cycle and lack special locomotory organelles belong to which phylum of Protozoa?
Options- A. Microspora
- B. Myxozoa
- C. Ciliophora
- D. Apicomplexa Discuss
- 5. Which of the following is used for the proper maintenance and preservation of pure cultures?
Options- A. Periodic transfer to fresh media
- B. Preservation by overlaying cultures with mineral oil
- C. Preservation by lyophilization
- D. All of the above Discuss
- 6. Some cyanobacteria produce potent neurotoxins that, if ingested, will kill humans. These cyanobacteria are most likely to contaminate
Options- A. water rich in organic carbon wastes but poor in phosphate
- B. water that are anoxic
- C. water rich in phosphate wastes but poor in organic carbon
- D. none of the above Discuss
- 7. Protease, which is used for flavouring of sake and haze removal in sake is produced by
Options- A. A. oryzae
- B. A. flavus
- C. B. cereus
- D. A. niger Discuss
- 8. Main function of an enzyme is to
Options- A. increase the activation energy
- B. decrease the activation energy
- C. maintain constant activation energy
- D. none of these Discuss
- 9. What is the order of reagents used in the Gram stain?
Options- A. Crystal violet, iodine, safranin, decolorizer
- B. Crystal violet, iodine, decolorizer, safranin
- C. Safranin, crystal violet, decolorizer, iodine
- D. Crystal violet, safranin, iodine, decolorizer Discuss
- 10. Polymorphonuclear leukocytes (or PMNs)
Options- A. can be attracted to the site of an infection following activation of complement
- B. are derived from bone marrow stem cells
- C. are a type of phagocyte that can engulf and kill bacteria
- D. all of the above Discuss
More questions
Correct Answer: lysogeny
Correct Answer: species of Proteus
Correct Answer: do not undergo spoilage by microorganisms
Correct Answer: Apicomplexa
Correct Answer: All of the above
Correct Answer: water rich in phosphate wastes but poor in organic carbon
Correct Answer: A. oryzae
Correct Answer: decrease the activation energy
Correct Answer: Crystal violet, iodine, decolorizer, safranin
Correct Answer: all of the above
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