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Home ‣ Microbiology ‣ Heated Canned Foods See What Others Are Saying!
- Question
The canned acid foods such as pineapple, tomatoes and pears have been found spoiled by C. pasteurianum. Such spoilage is more likely when the pH of the food is
Options- A. >4.5
- B. <4.5
- C. >5.3
- D. <5.3
- Correct Answer
- >4.5
- 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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