Discussion
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- Question
Black mold rot is caused by
Options- A. A.flavus
- B. A. niger
- C. Trichoderma
- D. Trichothecium roseum
- Correct Answer
- A. niger
- 1. The sigma factor
Options- A. is responsible for recognizing the termination sequence
- B. provides the catalytic function of cleaving off pyrophosphates during mRNA synthesis
- C. recognizes the promotor
- D. accomplishes DNA restriction Discuss
- 2. An "International Unit" of penicillin activity established in 1944 is amount of penicillin equivalent to
Options- A. 0.6 micrograms of crystalline penicillin G of about 98% purity
- B. 0.6 micrograms of crystalline penicillin F of about 98% purity
- C. 0.8 micrograms of crystalline penicillin G of about 98% purity
- D. 0.8 micrograms of crystalline penicillin G of about 90% purity Discuss
- 3. A psychrophilic halophile would be a microbe that prefers
Options- A. cold temperatures and increased amounts of salt
- B. warm temperatures and increased amounts of pressure
- C. cold temperatures and the absence of oxygen
- D. warm temperatures and increased amounts of acid Discuss
- 4. Coliforms are used as indicator organisms because
Options- A. they are present wherever enteric pathogens are present
- B. a testing procedure with great specificity is easy to perform
- C. both (a) and (b)
- D. none of the above Discuss
- 5. If the free energy change (?G) in a reaction is a negative value, it indicates that the
Options- A. reaction releases energy
- B. reaction absorbs energy
- C. reaction is in negative direction
- D. reaction is in positive direction Discuss
- 6. Gram-negative bacteria, responsible for food poisoning, is/are
Options- A. Salmonella
- B. Pseudomonas
- C. Clostridia
- D. None of these Discuss
- 7. Most strains of Staphylococcus aureus indicate
Options- A. phosphatase production
- B. a golden-yellow pigment
- C. ?-haemolysis on sheep blood agar
- D. all of the above Discuss
- 8. An enrichment medium for the isolation of Shigella is
Options- A. Alkaline peptone water
- B. Terathionate broth
- C. Selenite F broth
- D. none of these Discuss
- 9. The bacteria, which is more resistant to adverse environmental conditions, is
Options- A. S sonnei
- B. S dysenteriae
- C. S flexneri
- D. S boydii Discuss
- 10. Icosahedral viruses are generally
Options- A. polio viruses
- B. adeno viruses
- C. both (a) and (b)
- D. none of these Discuss
More questions
Correct Answer: recognizes the promotor
Correct Answer: 0.6 micrograms of crystalline penicillin G of about 98% purity
Correct Answer: cold temperatures and increased amounts of salt
Correct Answer: both (a) and (b)
Correct Answer: reaction releases energy
Correct Answer: Salmonella
Correct Answer: all of the above
Correct Answer: Selenite F broth
Correct Answer: S sonnei
Correct Answer: both (a) and (b)
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