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- Question
Radioisotopes are frequently used in the study of cells. Assume a culture of E. coli is grown in a culture medium containing radioactive sulphur. At the end of 48 hours, it is expected to find the radioactive label located in
Options- A. DNA
- B. enzymes
- C. RNA
- D. all of these
- Correct Answer
- enzymes
- 1. The nitrofurans differ from the antibiotics in that they
Options- A. do not occur naturally
- B. occur naturally
- C. are antimicrobial drugs
- D. all of these Discuss
- 2. Anaerobic degradation of proteins brought about by bacteria and fungi give the products like
Options- A. mercaptans and indole
- B. H2S
- C. both (a) and (b)
- D. None of these Discuss
- 3. Which capsid symmetry is exhibited by most of the phages?
Options- A. Helical
- B. Icosahedral
- C. Complex
- D. None of these Discuss
- 4. The cell reproduction in bacteria may occur by
Options- A. binary fission
- B. budding
- C. fragmentation
- D. all of these Discuss
- 5. The different ACC's between food categories reflect the
Options- A. expected level of contamination of the raw material
- B. potential for microbial growth during storage
- C. potential shelf life
- D. all of the above Discuss
- 6. The acetate-utilizing methanogens are responsible for
Options- A. 20% of methane produced in a biogas reactor
- B. 50% of methane produced in a biogas reactor
- C. 70% of methane produced in a biogas reactor
- D. 85% of methane produced in a biogas reactor Discuss
- 7. Organisms, using organic compounds as electron donors are called
Options- A. lithotrophs
- B. phototrophs
- C. chemotrophs
- D. organotrophs Discuss
- 8. Transfer of infection from cell to cell occurs mainly by direct transfer of virions via
Options- A. plasmodesmata
- B. cytodesmata
- C. protodesmata
- D. none of these Discuss
- 9. Parsnip like odour and taste in beer is caused by
Options- A. Flavobacterium proteus
- B. Zygomonas anaeroium
- C. Lactobacillus patorianus
- D. S. carlsbergensis Discuss
- 10. Immunization with which of the following toxoid induces high titer serum antibody, but does not protect from the corresponding disease?
Options- A. Tetanus
- B. Botulism
- C. Diphtheria
- D. Shigellosis Discuss
More questions
Correct Answer: do not occur naturally
Correct Answer: both (a) and (b)
Correct Answer: Icosahedral
Correct Answer: all of these
Correct Answer: all of the above
Correct Answer: 70% of methane produced in a biogas reactor
Correct Answer: organotrophs
Correct Answer: plasmodesmata
Correct Answer: Flavobacterium proteus
Correct Answer: Botulism
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