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- Question
Type III secretion systems are used to inject "effector" proteins directly into a host cell. Salmonella uses a type III secretion system to help the pathogen to
Options- A. survive the acid pH of the stomach
- B. secrete LT (heat labile toxin) and ST (heat stable toxin) into the lumen of the intestine
- C. survive within macrophages
- D. activate T cells to proliferate and secrete cytokines
- Correct Answer
- survive within macrophages
- 1. Which of the following is true to prevent botulism from smoked fish?
Options- A. The fish should be heated at its coolest part to at least 82°C for 30 min during or after smoking
- B. Fish should be immediately frozen after packaging and kept frozen
- C. Good sanitation should be maintained throughout production and handling
- D. All of the above Discuss
- 2. The ability of a competitive inhibitor to bind to an active site in an allosterically controlled enzyme is __________ than the ability of a non-competitive inhibitor to bind to an active site in the same allosterically controlled enzyme.
Options- A. greater
- B. lesser
- C. approximately equal
- D. half Discuss
- 3. Flagella move the cell by
Options- A. many flagella beating in a synchronous, whip-like motion
- B. an individual flagellum beating in a whip-like motion
- C. spinning like a propeller
- D. attaching to nearby particles and contracting Discuss
- 4. Which of the following structure is present in prokaryotic cells?
Options- A. Mitochondria
- B. Chloroplasts
- C. Golgi structure
- D. Mesosome Discuss
- 5. Naringinase, an enzyme commonly used for removal of bitter taste from citrus juice is obtained from
Options- A. A. niger
- B. A.flavus
- C. A. oryzae
- D. S. cerevisiae Discuss
- 6. The organism which utilizes the pentose of sulphite waste liquor for lactic acid production is
Options- A. Streptococcus lactis
- B. Lactobacillus bulgaricus
- C. Lactobacillus casei
- D. Lactobacillus pentosus Discuss
- 7. Lysozyme (an endolysin) which will lyse the bacterial cell, releasing the mature virions is present in
Options- A. immediate early phage genes
- B. late genes
- C. delayed early genes
- D. all of these Discuss
- 8. Most reliable test for detection of hepatitis E infection is
Options- A. ELISA test for IgM anti-HEV
- B. Western blot assay for IgM anti-HEV
- C. Polymerase chain reaction for detection of HEV RNA
- D. ELISA test for IgG anti-HEV Discuss
- 9. One of the first enzymes synthesized by many bacteriophage is __________ , an RNA-dependent RNA polymerase.
Options- A. RNA transcriptase
- B. RNA polymerase
- C. RNA ligase
- D. RNA replicase Discuss
- 10. Canned sweetened condensed milk may become thickened by
Options- A. Bacillus species
- B. Clostridium species
- C. Micrococcus species
- D. Saccharomyces species Discuss
More questions
Correct Answer: All of the above
Correct Answer: greater
Correct Answer: spinning like a propeller
Correct Answer: Mesosome
Correct Answer: A. niger
Correct Answer: Lactobacillus pentosus
Correct Answer: late genes
Correct Answer: Polymerase chain reaction for detection of HEV RNA
Correct Answer: RNA replicase
Correct Answer: Micrococcus species
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