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- Question
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
- Correct Answer
- Both (a) and (b)
- 1. Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is
Options- A. actin
- B. interleukin
- C. HLA
- D. CD8 Discuss
- 2. Which of the following disease is caused by DNA viruses?
Options- A. Poliomyelitis
- B. Yellow fever
- C. Measles
- D. Small pox Discuss
- 3. Gassiness resulting from the liberation of carbon dioxide by hetero fermentative lactics is called
Options- A. pousse
- B. amertume
- C. mannitic
- D. none of these Discuss
- 4. Which of the following statements is false regarding B cells?
Options- A. B cells can undergo class switching and produce a different antibody type
- B. B one marrow stem cells migrate to the thymus and develop into B cells
- C. B cells synthesize antibodies and put them on their cell surface
- D. B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow Discuss
- 5. What is common in catheters and ventilators?
Options- A. They bypass important defenses of the body
- B. Bacteria responsible for associated infections are usually susceptible to antibiotics
- C. They predispose patients to viral rather than bacterial infections
- D. They are used primarily in neonatal intensive care units Discuss
- 6. Pseudomembraneous colitis is
Options- A. precipitated by the use of certain antibiotics
- B. caused by a gram-positive bacterium
- C. caused by a spore-forming bacterium
- D. all of the above Discuss
- 7. Which of the following toxin resembles cholera toxin?
Options- A. Stable toxin of E. coli
- B. Diphtheria toxin
- C. Labile toxin of Escherichia coli
- D. Tetanus toxin Discuss
- 8. Catalase production is negative in which of the following?
Options- A. Streptococcus
- B. Salmonella
- C. Proteus
- D. Staphylococcus Discuss
- 9. The "A" subunit of diphtheria toxin
Options- A. binds host cell receptors found on heart cells
- B. cause ADP ribosylation of a factor involved in protein synthesis
- C. forms cAMP that leads to fluid accumulation
- D. lysis macrophages with the release of cytokines Discuss
- 10. The process of Gram staining is based on the ability of bacterial cell wall
Options- A. to retain the safranin dye
- B. to retain the crystal violet dye during solvent treatment.
- C. to retain part of both dyes
- D. none of above Discuss
More questions
Correct Answer: CD8
Correct Answer: Small pox
Correct Answer: pousse
Correct Answer: B one marrow stem cells migrate to the thymus and develop into B cells
Correct Answer: They bypass important defenses of the body
Correct Answer: all of the above
Correct Answer: Labile toxin of Escherichia coli
Correct Answer: Streptococcus
Correct Answer: cause ADP ribosylation of a factor involved in protein synthesis
Correct Answer: to retain the crystal violet dye during solvent treatment.
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