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MCQs

Total Questions : 463 | Page 6 of 47 pages
Question 51. The function of a viral capsid is
  1.    protection against the viral genome from physical and enzymatic destruction
  2.    providing binding sites that enable the virus to attach to specific receptor sites on the host cell
  3.    serving as a vehicle of transmission from one host to another
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 52. Which of the following viruses are relatively thermostable?
  1.    Human immunodeficiency virus
  2.    Rubella virus
  3.    Hepatits A virus
  4.    Influenza virus
 Discuss Question
Answer: Option C. -> Hepatits A virus
Answer: (c).Hepatits A virus
Question 53. Which of the following oncogenic viruses was first detected?
  1.    Rous sarcoma virus.
  2.    Epstein-Barr virus
  3.    Herpes simplex virus type 2
  4.    Human T cell leukaemia virus
 Discuss Question
Answer: Option A. -> Rous sarcoma virus.
Answer: (a).Rous sarcoma virus.
Question 54. The time from infection until lysis is called as
  1.    eclipse period
  2.    rise period
  3.    latent period
  4.    burst size
 Discuss Question
Answer: Option C. -> latent period
Answer: (c).latent period
Question 55. The yield of phage per bacterium is called the
  1.    eclipse size
  2.    latent size
  3.    burst size
  4.    none of these
 Discuss Question
Answer: Option C. -> burst size
Answer: (c).burst size
Question 56. Which of the following are obligate intracellular parasites?
  1.    Chlamydia
  2.    Viruses
  3.    Rickettsia
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 57. The extracellular phage number increases until a constant titer at the end of the multiplication cycle. This time interval is termed as
  1.    eclipse period
  2.    rise period
  3.    latent period
  4.    burst size
 Discuss Question
Answer: Option B. -> rise period
Answer: (b).rise period
Question 58. Which of the following statements is correct?
  1.    Up to 10% of human tumours have a viral risk factor
  2.    Up to 40% of human tumours have a viral risk factor
  3.    Up to 30% of human tumours have a viral risk factor
  4.    Up to 20% of human tumours have a viral risk factor
 Discuss Question
Answer: Option D. -> Up to 20% of human tumours have a viral risk factor
Answer: (d).Up to 20% of human tumours have a viral risk factor
Question 59. Viruses can be purified based on their size and density by using
  1.    gradient centrifugation
  2.    differential centrifugation
  3.    precipitation
  4.    none of these
 Discuss Question
Answer: Option A. -> gradient centrifugation
Answer: (a).gradient centrifugation
Question 60. Diameter of 'hepadnavirus' is
  1.    75 nm
  2.    42 nm
  3.    55 nm
  4.    23 nm
 Discuss Question
Answer: Option B. -> 42 nm
Answer: (b).42 nm

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