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- Question
If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?
Options- A. 1
- B. 5
- C. 10
- D. 50
- Correct Answer
- 10
- 1. Which is most likely to be exposed on the surface of a gram-negative bacterium?
Options- A. Pore protein (porin)
- B. Protein involved in energy generation
- C. Lipoteichoic acid
- D. Phospholipids Discuss
- 2. All of the following are features of prokaryotes except
Options- A. nitrogen fixation
- B. photosynthesis
- C. sexual reproduction
- D. locomotion Discuss
- 3. High acid foods with a pH above 5.3 are especially subjected to
Options- A. flat sour spoilage
- B. putrefaction
- C. both (a) and (b)
- D. TA spoilage Discuss
- 4. The binomial name of a microbe is composed of
Options- A. its kingdom and genus names
- B. its genus name and a species modifier
- C. its family and class names
- D. its genus and species names Discuss
- 5. Induction of tolerance mechanism(s) is/are
Options- A. suppression
- B. clonal deletion
- C. clonal anergy
- D. all of these Discuss
- 6. Why high concentration of sugars are not employed in the fermentation medium?
Options- A. Calcium lactate is not produced
- B. Calcium lactate crystallizes from the medium and slows down the process of fermentation
- C. High sugar concentration itself crystallizes
- D. None of the above Discuss
- 7. A cluster of polar flagella is called
Options- A. lophotrichous
- B. amphitrichous
- C. monotrichous
- D. petritrichous Discuss
- 8. Which of the following chemotherapeutic agents may affect the growth of Campylobacter jejuni?
Options- A. Vacomycin
- B. Polymyxin
- C. Trimethoprim
- D. None of these Discuss
- 9. T-even phage binding to E. coli probably involves
Options- A. electrostatic interaction
- B. hydrophobic interaction
- C. covalent bonds
- D. all of these Discuss
- 10. Genetic variations are
Options- A. temporary
- B. influenced by the environment
- C. stable
- D. not heritable Discuss
More questions
Correct Answer: Pore protein (porin)
Correct Answer: sexual reproduction
Correct Answer: both (a) and (b)
Correct Answer: its genus name and a species modifier
Correct Answer: all of these
Correct Answer: Calcium lactate crystallizes from the medium and slows down the process of fermentation
Correct Answer: lophotrichous
Correct Answer: None of these
Correct Answer: electrostatic interaction
Correct Answer: stable
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