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- Question
Microaerophilic bacteria are those which require
Options- A. 21 % oxygen for growth
- B. low levels of oxygen for growth (lesser than O2 present in atmosphere)
- C. oxygen for activation of enzymes
- D. none of the above
- Correct Answer
- low levels of oxygen for growth (lesser than O2 present in atmosphere)
- 1. Which of the following can readily kill Salmonellae?
Options- A. Moist heat at 55°C for 20 min
- B. Moist heat at 55°C for 10 min
- C. Moist heat at 55°C for 30 min
- D. Moist heat at 55°C for 1 hr Discuss
- 2. Which of the following is correct?
Options- A. All members of photolithotrophic autotrophs are also members of algae, but not all members of algae are members of photolithotrophic autotrophs
- B. All members of algae are also members of photolithotrophic autotrophs, but not all members of photolithotrophic autotrophs are members of algae
- C. All members of photolithotrophic autotrophs are members of algae, and all members of algae are members of photolithotrophic autotrophs
- D. No member of photolithotrophic autotrophs is a member of algae Discuss
- 3. Which of the following best describes the algae known as diatoms?
Options- A. Cells have intricate shells of silicon dioxide with two halves
- B. Cells are encased in rigid walls composed of cellulose coated with silicon
- C. Cells have flagella and a light-detecting eye spot
- D. Cells contain carotenoid pigments as well as chlorophyll A and B Discuss
- 4. Alcohol production from starch and raw sugar utilizes selected strains of
Options- A. Saccharomyces cerevisiae
- B. Candida pseudotropicalis
- C. Candida utilis
- D. none of these Discuss
- 5. Which of the following is not an industrial product made by the fungus Aspergillus niger?
Options- A. Galactosidase
- B. Citric acid
- C. Gluconic acid
- D. Lysine Discuss
- 6. Lag phase is also known as
Options- A. period of initial adjustment
- B. transitional period
- C. generation time
- D. none of these Discuss
- 7. Salmonellois is caused by the
Options- A. enterotoxin of Salmonella spp
- B. endotoxin of Salmonella spp
- C. neurotoxin of Salmonella spp
- D. exoenterotoxin of Salmonella spp Discuss
- 8. Which of the following substance is employed to neutralize the lactic acid as it is produced (because lactic acid bacteria do not tolerate high concentrations of acid?
Options- A. CaCO3
- B. (NH4)2 HPO4
- C. MgSO4
- D. Na2SO4 Discuss
- 9. Which of the following is a gram-positive bacteria?
Options- A. Lactobacillus
- B. Staphylococci
- C. Streptococci
- D. All of these Discuss
- 10. Number of motility structures on flagellated cells is
Options- A. greater than ciliated cells
- B. lesser than ciliated cells
- C. equal to ciliated cells
- D. none of these Discuss
More questions
Correct Answer: Moist heat at 55°C for 1 hr
Correct Answer: All members of algae are also members of photolithotrophic autotrophs, but not all members of photolithotrophic autotrophs are members of algae
Correct Answer: Cells have intricate shells of silicon dioxide with two halves
Correct Answer: Saccharomyces cerevisiae
Correct Answer: Lysine
Correct Answer: period of initial adjustment
Correct Answer: endotoxin of Salmonella spp
Correct Answer: CaCO3
Correct Answer: All of these
Correct Answer: lesser than ciliated cells
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