Viruses problems
- 1. Lysozyme (an endolysin) which will lyse the bacterial cell, releasing the mature virions is present in
Options- A. immediate early phage genes
- B. late genes
- C. delayed early genes
- D. all of these Discuss
Correct Answer: late genes
- 2. The oncogene theory refers to
Options- A. how chemicals inactivate viruses when applied
- B. how viruses replicate in host cells
- C. how viruses transform normal cells into tumor cells
- D. none of these Discuss
Correct Answer: how viruses transform normal cells into tumor cells
- 3. The temperate phage possesses a gene that codes for a repressor protein which makes the cell resistant to lysis initiated by
Options- A. the prophage
- B. lytic infection by other viruses
- C. Both (a) and (b)
- D. none of these Discuss
Correct Answer: Both (a) and (b)
- 4. Reverse transcriptase is a useful enzyme to have when
Options- A. an RNA virus converts its RNA to DNA
- B. there are no host cells present
- C. nutrients are scarce
- D. spikes are forming in the new virus Discuss
Correct Answer: an RNA virus converts its RNA to DNA
- 5. 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
Options- A. penton
- B. polyhedra
- C. icosahedral
- D. helical Discuss
Correct Answer: penton
- 6. Which of the following statements is not true of viruses?
Options- A. Viruses have been successfully grown in pure cultures in test tubes
- B. All viruses are obligatory intracellular parasites
- C. All viruses have either DNA or RNA as their genetic material
- D. Viruses probably arose from small fragments of cellular chromosomes Discuss
Correct Answer: Viruses have been successfully grown in pure cultures in test tubes
- 7. The repressor protein, since the cell is resistant to lysis from externally infecting phage, is also called
Options- A. immunity repressor
- B. immunity operon
- C. operon repressor
- D. none of these Discuss
Correct Answer: immunity repressor
- 8. Viruses largely lack metabolic machinery of their own to generate energy or to synthesize
Options- A. protein
- B. carbohydrate
- C. alcohol
- D. all of these Discuss
Correct Answer: protein
- 9. Group E phages have
Options- A. single stranded DNA
- B. double stranded DNA
- C. single stranded RNA
- D. double stranded DNA Discuss
Correct Answer: single stranded RNA
- 10. Which of the following viruses show/s transformation of infected cells?
Options- A. Hepatitis B virus
- B. Human T cell lymphotronic virus type I
- C. Epstein-Barr virus
- D. All of these Discuss
Correct Answer: All of these
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