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- Question
Which of the following is correct?
Options- A. Mycorrhizae are fungi that form a mutually beneficial (symbiotic) relationship with plant roots
- B. The fungi aid in transmitting nutrients and water to the plant roots
- C. The increased nutrient availability from mycorrhizae is thought to be due to the additional absorbing surface provided by the fungi
- D. All of the above
- Correct Answer
- All of the above
- 1. A mutagen is defined as
Options- A. an enzyme that repairs mutations
- B. a chemical or physical agent that induces mutations
- C. an inhibitor of gene modification
- D. a molecule which stabilizes DNA thus prevents mutations from occurring Discuss
- 2. The penicillin F which was produced at first, required the mold
Options- A. Penicillium chrysogenum
- B. Pencillium notatum
- C. Pencillium chrysogenum Q-176
- D. none of the above Discuss
- 3. What is the function of positive strand in double stranded RNA viruses?
Options- A. Synthesis of protein
- B. Production of ribosomes
- C. Both (a) and (b)
- D. None of these Discuss
- 4. Chlamydomonas and Volvox are similar because
Options- A. they both are motile
- B. they are members of the Chlorophyta
- C. Both (a) and (b)
- D. none of these Discuss
- 5. In Widal test, the significant titre for O agglutinins is generally
Options- A. 1:50 or more
- B. 1:100 or more
- C. 1:150 or more
- D. 1:2.00 or more Discuss
- 6. Fluoroquinolones are antibiotics which inhibit
Options- A. DNA polymerase
- B. RNA polymerase
- C. DNA gyrase
- D. Cross-linking of peptidoglycan Discuss
- 7. Which of the following statement(s) is/are true in regards to F+ x F- mating events?
Options- A. DNA is transferred from F- to F+ cells
- B. DNA is transferred from F+ to F- cells
- C. No DNA is transferred because F- cells are unable to perform conjugation
- D. No DNA is transferred because F+ cells are unable to perform conjugation Discuss
- 8. Which of the following may contain fimbriae?
Options- A. Gram-positive bacteria
- B. Gram-negative bacteria
- C. Both (a) and (b)
- D. None of these Discuss
- 9. Rickes et al. recovered active crystalline vitamin B12 from the culture of
Options- A. Streptomyces griseus
- B. Bacillus megaterium
- C. Streptomyces olivaceus
- D. Streptomyces lactis Discuss
- 10. When using alcohol as an antiseptic, which concentration is considered most effective?
Options- A. 95%
- B. 50%
- C. 70%
- D. 25% Discuss
More questions
Correct Answer: a chemical or physical agent that induces mutations
Correct Answer: Pencillium notatum
Correct Answer: Synthesis of protein
Correct Answer: Both (a) and (b)
Correct Answer: 1:100 or more
Correct Answer: DNA gyrase
Correct Answer: DNA is transferred from F+ to F- cells
Correct Answer: Gram-negative bacteria
Correct Answer: Streptomyces griseus
Correct Answer: 70%
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