Discussion
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- Question
Intestinal bacteria can grow in the presence of __________ whereas nonintestinal bacteria are usually inhibited.
Options- A. bile salts
- B. low concentration of various dyes
- C. sugars
- D. low levels of nitrogen
- Correct Answer
- bile salts
- 1. Important example(s) of enriched medium/media is/ are
Options- A. Loeffler's serum slope
- B. Bordet-gengou medium
- C. Blood agar
- D. All of these Discuss
- 2. To select cholera-causing bacterium, Vibrio cholerae, the pH of the medium is maintained at a pH of
Options- A. 8.5
- B. 8.90
- C. 6.79
- D. 3.5 Discuss
- 3. 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 Discuss
- 4. In the pour plate method, the mixed culture is diluted directly in tubes of
Options- A. liquid agar medium
- B. sterile liquid usually water
- C. both (a) and (b)
- D. none of these Discuss
- 5. In the process of freeze drying, a dense cell suspension is placed in small vials and is frozen at
Options- A. -60 to -78°C
- B. -20 to -30°C
- C. -30 to -48°C
- D. -48 to -58°C Discuss
- 6. Agar is used for solidifying culture media because
Options- A. it does not affect by the growth of bacteria
- B. it does not add to the nutritive properties of the medium
- C. the melting and solidifying points of agar solution are not the same
- D. all of the above Discuss
- 7. The medium which allows the growth of more than one microorganisms of interest but with morphologically distinguishable colonies is known as
Options- A. selective medium
- B. enrichment medium
- C. differential medium
- D. none of these Discuss
- 8. Cell counting can be carried out by
Options- A. direct microscopic count using petroffhansser counting chamber
- B. plate counting
- C. membrane filter count
- D. all of the above Discuss
- 9. 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
- 10. Which of the following bacteria can grow in acidic pH?
Options- A. Vibrio cholerae
- B. Lactobacilli
- C. Shigella
- D. Salmonella Discuss
Cell Cultures and Characteristics problems
Search Results
Correct Answer: All of these
Correct Answer: 8.5
Correct Answer: 80°C for 10 minutes
Correct Answer: liquid agar medium
Correct Answer: -60 to -78°C
Correct Answer: all of the above
Correct Answer: differential medium
Correct Answer: all of the above
Correct Answer: All of the above
Correct Answer: Lactobacilli
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