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MCQs

Total Questions : 463 | Page 3 of 47 pages
Question 21. Which of the following may affect proteins and nucleic acids, but not viruses?
  1.    Denaturation
  2.    Enzyme treatment
  3.    Pressure
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 22. Which of the following statements is not true of viruses?
  1.    Viruses have been successfully grown in pure cultures in test tubes
  2.    All viruses are obligatory intracellular parasites
  3.    All viruses have either DNA or RNA as their genetic material
  4.    Viruses probably arose from small fragments of cellular chromosomes
 Discuss Question
Answer: Option A. -> Viruses have been successfully grown in pure cultures in test tubes
Answer: (a).Viruses have been successfully grown in pure cultures in test tubes
Question 23. Which of the following viruses belong/s to family caliciviridae?
  1.    Hepatitis B virus
  2.    Hepatitis D virus
  3.    Hepatitis E virus
  4.    All of these
 Discuss Question
Answer: Option C. -> Hepatitis E virus
Answer: (c).Hepatitis E virus
Question 24. In the simplest capsid, there is a capsomere at each of the 12 vertices; this capsomere, which is surrounded by five other capsomeres, is termed a
  1.    penton
  2.    polyhedra
  3.    icosahedral
  4.    helical
 Discuss Question
Answer: Option A. -> penton
Answer: (a).penton
Question 25. 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.    lysogeny
  2.    spontaneous induction
  3.    lytic phase
  4.    none of these
 Discuss Question
Answer: Option A. -> lysogeny
Answer: (a).lysogeny
Question 26. The size of viruses is usually measured in
  1.    centimeters
  2.    micrometers
  3.    nanometers
  4.    millimeters
 Discuss Question
Answer: Option C. -> nanometers
Answer: (c).nanometers
Question 27. The temperate phage that have no site specificity for insertion and may even be able to insert multiple copies of their DNA into a single bacterial chromosome is
  1.    λ phage enzyme
  2.    λ DNA
  3.    Phage Mu
  4.    Phage Mn
 Discuss Question
Answer: Option C. -> Phage Mu
Answer: (c).Phage Mu
Question 28. Which of the following is continuous cell line?
  1.    HeLa
  2.    HEp-2
  3.    KB
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 29. Lysozyme (an endolysin) which will lyse the bacterial cell, releasing the mature virions is present in
  1.    immediate early phage genes
  2.    late genes
  3.    delayed early genes
  4.    all of these
 Discuss Question
Answer: Option B. -> late genes
Answer: (b).late genes
Question 30. Enzyme neuraminidase is carried by which of the following viruses?
  1.    Human immunodeficiency virus
  2.    Epstein-Barr virus
  3.    Influenza virus
  4.    Adenovirus
 Discuss Question
Answer: Option C. -> Influenza virus
Answer: (c).Influenza virus

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