Viruses problems
- 1. The time from infection until lysis is called as
Options- A. eclipse period
- B. rise period
- C. latent period
- D. burst size Discuss
Correct Answer: latent period
- 2. Which of the following are obligate intracellular parasites?
Options- A. Chlamydia
- B. Viruses
- C. Rickettsia
- D. All of these Discuss
Correct Answer: All of these
- 3. Virus reproduces in living cells by
Options- A. replication
- B. duplication
- C. multiplication
- D. all of these Discuss
Correct Answer: replication
- 4. Which of the following statements is correct?
Options- A. Up to 10% of human tumours have a viral risk factor
- B. Up to 40% of human tumours have a viral risk factor
- C. Up to 30% of human tumours have a viral risk factor
- D. Up to 20% of human tumours have a viral risk factor Discuss
Correct Answer: Up to 20% of human tumours have a viral risk factor
- 5. What kind of embryo is often used for viral assays?
Options- A. Mouse
- B. Rat
- C. Cat
- D. Chicken Discuss
Correct Answer: Chicken
- 6. Which of the following bacteriophage is said to have banal symmetry?
Options- A. T2
- B. T4
- C. T6
- D. all of these Discuss
Correct Answer: all of these
- 7. Which of the following viruses are relatively thermostable?
Options- A. Human immunodeficiency virus
- B. Rubella virus
- C. Hepatits A virus
- D. Influenza virus Discuss
Correct Answer: Hepatits A virus
- 8. The most complex type of bacterial viruses having hexagonal head, a rigid tail with a contractile sheath and tall fibers is morphologically classified as
Options- A. A
- B. B
- C. C
- D. D Discuss
Correct Answer: A
- 9. The most popular indirect method of counting virus particles is by
Options- A. hemagglutination assay
- B. plaque-assay
- C. counting plaque-forming units
- D. colony counting Discuss
Correct Answer: hemagglutination assay
- 10. The function of a viral capsid is
Options- A. protection against the viral genome from physical and enzymatic destruction
- B. providing binding sites that enable the virus to attach to specific receptor sites on the host cell
- C. serving as a vehicle of transmission from one host to another
- D. all of the above Discuss
Correct Answer: all of the above
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