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Home ‣ Microbiology ‣ DNA Sequencing, Mutation and Repair See What Others Are Saying!
- Question
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
- Correct Answer
- a chemical or physical agent that induces mutations
- 1. It is mandatory that cultures and fermentation residues be sterilized before discard in case of Eremothecium ashbyii and Ashbya gossypii because they are
Options- A. plant pathogens
- B. human pathogens
- C. plant mutants
- D. none of these Discuss
- 2. Self reactive antibodies are not found in significant concentration in normal serum because
Options- A. it is impossible to generate a self-reactive antibody
- B. self reactive B cells are killed by CD8 T cells
- C. B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide
- D. self reactive B cells switch to IgA which is all secreted and not present in serum Discuss
- 3. Which of the following may account for the small size of the cells?
Options- A. The rate of diffusion
- B. The surface area/volume ratio
- C. The number of mRNAs that can be produced by the nucleus
- D. All of the above Discuss
- 4. The original enzyme(s) used in PCR reaction is/are known as
Options- A. E. coli DNA polymerase
- B. E. coli RNA polymerase
- C. Taq polymerase
- D. all of these Discuss
- 5. Fungi are important in the production of all of the following commercial products except
Options- A. bread
- B. beer
- C. cheese
- D. rubber Discuss
- 6. Which of the following is least likely to have a rigid cell wall?
Options- A. Bacterium
- B. Archaean
- C. Fungus
- D. Protozoan Discuss
- 7. The term used for plasmids possessing both RTF and r determinants is
Options- A. non self-transmissible plasmids
- B. non conjugative plasmids
- C. conjugative plasmids
- D. none of the above Discuss
- 8. 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
- 9. All of the following are features of prokaryotes except
Options- A. nitrogen fixation
- B. photosynthesis
- C. sexual reproduction
- D. locomotion Discuss
- 10. 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
More questions
Correct Answer: plant pathogens
Correct Answer: B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide
Correct Answer: All of the above
Correct Answer: E. coli DNA polymerase
Correct Answer: rubber
Correct Answer: Protozoan
Correct Answer: conjugative plasmids
Correct Answer: Pore protein (porin)
Correct Answer: sexual reproduction
Correct Answer: both (a) and (b)
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