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MCQs

Total Questions : 463 | Page 44 of 47 pages
Question 431. . The bacterial viruses having head made up of large capsomeres, but no tail is morphologically classified as
  1.    A
  2.    B
  3.    C
  4.    D
 Discuss Question
Answer: Option D. -> D
Question 432. . The temperate phage possesses a gene that codes for a repressor protein which makes the cell resistant to lysis initiated by
  1.    the prophage
  2.    lytic infection by other viruses
  3.    Both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option C. -> Both (a) and (b)
Question 433. . Bacteriophages have been used widely in genetic research, since they are the smallest and simplest biological entities capable of
  1.    self-replication
  2.    duplication
  3.    self-duplication
  4.    multiplication
 Discuss Question
Answer: Option A. -> self-replication
Question 434. . Which one is not useful in the treatment of viruses except
  1.    acyclovir
  2.    interferon
  3.    penicillin
  4.    antibodies
 Discuss Question
Answer: Option C. -> penicillin
Question 435. . The envelope of an enveloped virus is derived from
  1.    the mitochondrion of the cell
  2.    the cell membrane
  3.    the endoplasmic reticulum of the cell
  4.    none of these
 Discuss Question
Answer: Option B. -> the cell membrane
Question 436. . Lesions on chorioallantoic membrane are produced by
  1.    Herpes B virus
  2.    Vaccinia virus
  3.    Herpes simplex virus
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 437. . What kind of embryo is often used for viral assays?
  1.    Mouse
  2.    Rat
  3.    Cat
  4.    Chicken
 Discuss Question
Answer: Option D. -> Chicken
Question 438. . The infected cells continue to reproduce themselves as well as the virus, and the mature virions are extruded from the cell surface continuously over a long period of time. This type of release mechanism is called a
  1.    productive infection
  2.    inductive infection
  3.    resultant infection
  4.    all of these
 Discuss Question
Answer: Option A. -> productive infection
Question 439. . The most popular indirect method of counting virus particles is by
  1.    hemagglutination assay
  2.    plaque-assay
  3.    counting plaque-forming units
  4.    colony counting
 Discuss Question
Answer: Option A. -> hemagglutination assay
Question 440. . Which of the following viruses belong to family Hepadnaviridae?
  1.    Hepatitis A virus
  2.    Hepatitis B virus
  3.    Hepatitis D virus
  4.    All of these
 Discuss Question
Answer: Option B. -> Hepatitis B virus

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