Microbiology of Foods problems
- 1. Suspected colonies of Staphylococcus aureus when grown on Baird-Parker medium shall show
Options- A. coagulase activity
- B. protease activity
- C. catalase activity
- D. none of these Discuss
Correct Answer: coagulase activity
- 2. Which of the following is not true for the thermal resistance of the bacterial cells?
Options- A. Cocci are usually more resistant than rods
- B. Higher the optimal and maximal temperatures for growth, higher the resistance
- C. Bacteria that clump considerably or form capsules are difficult to kill
- D. Cells low in lipid content are harder to kill than other cells Discuss
Correct Answer: Cells low in lipid content are harder to kill than other cells
- 3. Which of the following acid will have higher bacteriostatic effect at a given pH?
Options- A. Acetic acid
- B. Tartaric acid
- C. Citric acid
- D. Maleic acid Discuss
Correct Answer: Acetic acid
- 4. Most spoilage bacteria grow at
Options- A. acidic pH
- B. alkaline pH
- C. neutral pH
- D. any of the pH Discuss
Correct Answer: neutral pH
- 5. The microbiological examination of coliform bacteria in foods preferably use
Options- A. MacConkey broth
- B. violet Red Bile agar
- C. eosine Methylene blue agar
- D. all of these Discuss
Correct Answer: all of these
- 6. 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
Correct Answer: all of the above
- 7. NaCl can act as
Options- A. antagonist at optimal concentrations
- B. synergistically if added in excess of optimum level
- C. Both (a) and (b)
- D. None of the above Discuss
Correct Answer: Both (a) and (b)
- 8. Water activity can act as
Options- A. an intrinsic factor determining the likelihood of microbial proliferation
- B. a processing factor
- C. an extrinsic factor
- D. all of the above Discuss
Correct Answer: all of the above
- 9. Enumeration of microorganism refers to
Options- A. either spiral plating, pour plate or spread plate of a food suspension on to a suitable selective agar, or non-selective plate, depending on the test
- B. either spiral plating, pour plate or spread plate of a food suspension on to a suitable selective agar
- C. non-selective plating, depending on the test
- D. none of the above Discuss
Correct Answer: either spiral plating, pour plate or spread plate of a food suspension on to a suitable selective agar, or non-selective plate, depending on the test
- 10. Examination of the presence / absence of organisms refers to
Options- A. incubation of a food suspension in an enrichment medium followed by inoculation on to a suitable selective medium.
- B. incubation of a food suspension in an enrichment medium followed by inoculation on to a non-selective medium.
- C. incubation of a food suspension in an enrichment medium
- D. none of the above Discuss
Correct Answer: incubation of a food suspension in an enrichment medium followed by inoculation on to a suitable selective medium.
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