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- Question
The unifying feature of the archaea that distinguishes them from the bacteria is
Options- A. habitats which are extreme environments with regard to acidity
- B. absence of a nuclear membrane temperature
- C. presence of a cell wall containing a characteristic outer membrane
- D. cytoplasmic ribosomes that are 70S
- Correct Answer
- absence of a nuclear membrane temperature
- 1. Acid foods with a pH between 4.5 and 3.7 usually are spoiled by
Options- A. B. coagulans
- B. Saccharolytic anaerobe
- C. both (a) and (b)
- D. none of these Discuss
- 2. 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
- 3. A bacterial food intoxication refers to
Options- A. illness caused by presence of pathogens
- B. food borne illness caused by the presence of a bacterial toxin formed in food
- C. both (a) and (b)
- D. none of the above Discuss
- 4. Botulism is caused by the presence of toxin developed by
Options- A. Clostridium tyrobutyricum
- B. Clostridium sporogenes
- C. Clostridium botulinum
- D. none of these Discuss
- 5. Peptone water and nutrient broth are
Options- A. selective media
- B. enriched media
- C. basal media
- D. none of these Discuss
- 6. When acetate is the sole source of carbon for some microorganisms, the cycle which is used, is called
Options- A. pentose phosphate pathway
- B. glycolyic pathway
- C. glyoxylate pathway
- D. oxaloacetate pathway Discuss
- 7. Organisms with amoeboid cells that move within a network of mucous tracks using a typical gliding motion belong to which phylum of Protozoa?
Options- A. Labyinthomorpha
- B. Microspora
- C. Apicomplexa
- D. Myxozoa Discuss
- 8. Under what conditions food poisoning bacteria may grow and produce toxins in vegetables?
Options- A. When thawed vegetables are held at refrigerated temperature for any considerable period
- B. When thawed vegetables are held at room temperature for any considerable period
- C. When thawed vegetables are held below refrigerated temperature for any considerable period
- D. None of the above Discuss
- 9. Why the bacterium Treponema pallidum is difficult to culture?
Options- A. Because it requires a great deal of water to reproduce
- B. Because it is unable to use carbohydrates as an energy source
- C. Because it lacks the genes needed for TCA cycle and oxidative phosphorylation
- D. Because it requires extremely low temperature at which water freezes Discuss
- 10. The two major components of viruses are
Options- A. fat and protein
- B. nucleic acid and protein
- C. carbohydrate and nucleic acid
- D. fat and carbohydrate Discuss
More questions
Correct Answer: both (a) and (b)
Correct Answer: coagulase activity
Correct Answer: food borne illness caused by the presence of a bacterial toxin formed in food
Correct Answer: Clostridium botulinum
Correct Answer: basal media
Correct Answer: glyoxylate pathway
Correct Answer: Labyinthomorpha
Correct Answer: When thawed vegetables are held at room temperature for any considerable period
Correct Answer: Because it lacks the genes needed for TCA cycle and oxidative phosphorylation
Correct Answer: nucleic acid and protein
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