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MCQs

Total Questions : 463 | Page 42 of 47 pages
Question 411. . The lysogenic state is governed by the activity of the regulatory region of the lambda phage genomes; this region is termed as
  1.    A. immunity repressor
  2.    immunity operon
  3.    operon repressor
  4.    none of these
 Discuss Question
Answer: Option B. -> immunity operon
Question 412. . The capsomeres consist of a number of proteins subunits or molecules called
  1.    protomers
  2.    caproprotein
  3.    procapsid
  4.    none of these
 Discuss Question
Answer: Option A. -> protomers
Question 413. . 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
Question 414. . Which of the following viruses belong to family Flaviviridae?
  1.    Rubella virus
  2.    Yellow fever virus
  3.    Hepatitis C virus
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 415. . Which of the following viruses show/s transformation of infected cells?
  1.    Hepatitis B virus
  2.    Human T cell lymphotronic virus type I
  3.    Epstein-Barr virus
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 416. . In order for a virus to replicate
  1.    the capsid must enter the host cell cytoplasm
  2.    the host cell must be undergoing mitosis
  3.    the genome must be released in the cytoplasm
  4.    the host cell must lack a cell membrane
 Discuss Question
Answer: Option C. -> the genome must be released in the cytoplasm
Question 417. . 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
Question 418. . 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
Question 419. . 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
Question 420. . 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

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