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- Question
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
- Correct Answer
- Both (a) and (b)
- 1. 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
- 2. 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
- 3. Organisms which have spore-forming stage in their life cycle and lack special locomotory organelles belong to which phylum of Protozoa?
Options- A. Microspora
- B. Myxozoa
- C. Ciliophora
- D. Apicomplexa Discuss
- 4. Which of the following is least likely to get in or on a protozoan such as a diplomonad or trichomonad?
Options- A. Flagella
- B. More than one nucleus
- C. Genes to produce a cyst form
- D. Rigid polysaccharide cell wall Discuss
- 5. Number of motility structures on flagellated cells is
Options- A. greater than ciliated cells
- B. lesser than ciliated cells
- C. equal to ciliated cells
- D. none of these Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Viruses problems
Search Results
Correct Answer: how viruses transform normal cells into tumor cells
Correct Answer: late genes
Correct Answer: Apicomplexa
Correct Answer: Rigid polysaccharide cell wall
Correct Answer: lesser than ciliated cells
Correct Answer: an RNA virus converts its RNA to DNA
Correct Answer: penton
Correct Answer: Viruses have been successfully grown in pure cultures in test tubes
Correct Answer: immunity repressor
Correct Answer: protein
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