viruses microbiology question and answers -Page 3

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Viruses problems

1. The sequence of nucleic acid in a variety of viruses and viral host, will find more similarities
Options
A. among different viruses than between viruses and their hosts
B. among different viral hosts than among different viruses
C. among different viral hosts than between viruses and their hosts
D. between viruses and their hosts than among different viruses

Discuss

Correct Answer: between viruses and their hosts than among different viruses

2. Usually viruses are separated into several large groups based primarily on
Options
A. nature of the host
B. nucleic acid characteristics
C. capsid symmetry
D. diameter of the viroin or nucleocapsid

Discuss

Correct Answer: nature of the host

3. Which of the following is continuous cell line?
Options
A. HeLa
B. HEp-2
C. KB
D. All of these

Discuss

Correct Answer: All of these

4. When a virus enters a cell but does not replicate immediately, the situation is called
Options
A. lysogeny
B. fermentation
C. symbiosis
D. synergism

Discuss

Correct Answer: lysogeny

5. A change from lysogeny to lysis is generally induced by
Options
A. ultraviolet light
B. chemicals
C. irradiation
D. all of these

Discuss

Correct Answer: ultraviolet light

6. Viruses require __________ for growth.
Options
A. bacteria
B. plants
C. animals
D. living cells

Discuss

Correct Answer: living cells

7. The first step in infection of a host bacterial cells by a phage is
Options
A. adsorption
B. absorption
C. penetration
D. replication

Discuss

Correct Answer: adsorption

8. The lysogenic state is governed by the activity of the regulatory region of the lambda phage genomes; this region is termed as
Options
A. immunity repressor
B. immunity operon
C. operon repressor
D. none of these

Discuss

Correct Answer: immunity operon

9. Which of the following viruses belong/s to family caliciviridae?
Options
A. Hepatitis B virus
B. Hepatitis D virus
C. Hepatitis E virus
D. All of these

Discuss

Correct Answer: Hepatitis E virus

10. Which of the following virus is susceptible to chloroform?
Options
A. Herpes
B. Influenza
C. Measles
D. All of these

Discuss

Correct Answer: All of these

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