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- Question
Eukaryotic cell organelles first emerged
Options- A. from a specialized lineage of cells within the kingdom Protista
- B. when prokaryotes engulfed each other and became interdependent
- C. when bacteria made their first attempts at reproduction
- D. just before the origin of the animal and fungal kingdoms
- Correct Answer
- when prokaryotes engulfed each other and became interdependent
- 1. A level of regulation, demonstrated by the termination of transcription if tryptophan is abundant, by the tryptophan operon in E.coli cells is called
Options- A. activation
- B. attenuation
- C. corepression
- D. desiccation Discuss
- 2. In DNA sequencing, the primer
Options- A. specifies where the sequence ends
- B. specifies where the sequence begins
- C. both (a) and (b)
- D. generates variety of different sized fragments Discuss
- 3. Some microorganisms have the ability to increase the nitrogen content of soils, are called as
Options- A. nitrogen fixation
- B. denitrification
- C. nitrification
- D. all of these Discuss
- 4. The cloning step in PCR/sequencing analysis of microbial communities is necessary for
Options- A. the amplification process
- B. preventing contamination by outside DNA
- C. separating the different rRNA gene sequences in the mixture
- D. none of these Discuss
- 5. A dense bacterial population caught in a tangled web of fibers sticking to a surface describes
Options- A. coagulation
- B. a biodisc
- C. a biofilm
- D. the membrane filter technique Discuss
- 6. Precipitation reaction is relatively less sensitive for the detection of
Options- A. antigens
- B. antigen-antibody complexes
- C. antibodies
- D. complement Discuss
- 7. The main difference between a self-transmissible and a mobilizable plasmid is that the self-transmissible plasmid
Options- A. transfers both strands of the plasmid DNA
- B. carries genes encoding the mating apparatus
- C. transfers antibiotic resistance genes
- D. usually has a transposon inserted into it Discuss
- 8. Cheese cancer of Swiss and similar cheese is caused by
Options- A. Oospora Crustacea
- B. Oospora caseovorans
- C. Oospora aurianticum
- D. none of these Discuss
- 9. A major organism used in commercial bioleaching for copper recovery is
Options- A. Desulfovibrio desulfuricans
- B. Pseudomonas aeruginosa
- C. Aspergillus niger
- D. Thiobacillus ferrooxidans Discuss
- 10. The organism used to produce L-glutamic acid is
Options- A. Micrococcus glutamicus
- B. Brevibacterium aminogenes
- C. Arthrobacter globiformis
- D. all of these Discuss
More questions
Correct Answer: attenuation
Correct Answer: specifies where the sequence begins
Correct Answer: nitrogen fixation
Correct Answer: separating the different rRNA gene sequences in the mixture
Correct Answer: a biofilm
Correct Answer: antibodies
Correct Answer: carries genes encoding the mating apparatus
Correct Answer: Oospora caseovorans
Correct Answer: Thiobacillus ferrooxidans
Correct Answer: all of these
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