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MCQs

Total Questions : 463 | Page 35 of 47 pages
Question 341. A change from lysogeny to lysis is generally induced by
  1.    all of these
  2.    ultraviolet light
  3.    irradiation
  4.    chemicals
 Discuss Question
Answer: Option B. -> ultraviolet light
Question 342. In cell culture, measles virus may lead to
  1.    transformation of cells
  2.    nuclear pyknosis
  3.    rounding and aggregation of cells
  4.    syncytium formation
 Discuss Question
Answer: Option D. -> syncytium formation
Question 343. Plant viruses may be cultivated in
  1.    tissue culture
  2.    all of these
  3.    whole plants
  4.    cultures of separated cells
 Discuss Question
Answer: Option B. -> all of these
Question 344. The lysogenic state is governed by the activity of the regulatory region of the lambda phage genomes; this region is termed as
  1.    immunity operon
  2.    immunity repressor
  3.    operon repressor
  4.    none of these
 Discuss Question
Answer: Option A. -> immunity operon
Question 345. In order for a virus to replicate
  1.    the genome must be released in the cytoplasm
  2.    the capsid must enter the host cell cytoplasm
  3.    the host cell must be undergoing mitosis
  4.    the host cell must lack a cell membrane
 Discuss Question
Answer: Option A. -> the genome must be released in the cytoplasm
Question 346. Which of the following viruses show/s transformation of infected cells?
  1.    Hepatitis B virus
  2.    Epstein-Barr virus
  3.    Human T cell lymphotronic virus type I
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 347. The capsomeres consist of a number of proteins subunits or molecules called
  1.    caproprotein
  2.    procapsid
  3.    none of these
  4.    protomers
 Discuss Question
Answer: Option D. -> protomers
Question 348. Which of the following viruses belong to family Flaviviridae?
  1.    Rubella virus
  2.    Hepatitis C virus
  3.    All of these
  4.    Yellow fever virus
 Discuss Question
Answer: Option C. -> All of these
Question 349. The viral DNA of the temperate phage, instead of taking over the functions of the cell's genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens in
  1.    lytic phase
  2.    lysogeny
  3.    spontaneous induction
  4.    none of these
 Discuss Question
Answer: Option B. -> lysogeny
Question 350. Which of the following statements is not true of viruses?
  1.    Viruses probably arose from small fragments of cellular chromosomes
  2.    Viruses have been successfully grown in pure cultures in test tubes
  3.    All viruses have either DNA or RNA as their genetic material
  4.    All viruses are obligatory intracellular parasites
 Discuss Question
Answer: Option B. -> Viruses have been successfully grown in pure cultures in test tubes

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