20 Assorted questions on Viruses

It is a well noted trend that a lot of questions appearing for competitive medical exams are heavily imbibed from very old NCERT textbooks as well as out-of-syllabus. This series of questions are prepared keeping in mind the extra portions and one-words that frequently come up for the A.I.P.M.T. Prelims, Kerala P.M.T., J.I.P.M.E.R. and also for the A.I.I.M.S. Examinations. I hope this helps you to get some additional useful information.

Self evaluation M.C.Q. Examination:
One question carries 4 marks if correct. If wrong the examinee is awarded -1 marks. There will be no marks for unattempted questions.

Maximum Marks:80
Pass Marks :40
Total time :20 minutes

1. The term virus in latin means?
a. poison
b. venom
c. toxin
d. only (a) and (b)

Ans: d

2. What are viruses?
a. nucleoproteins
b. lipoproteins
c. macroproteins
d. globular nucleolipids

Ans:a

3. What are virions?
a. complete virus
b. incomplete virus
c. virus capable of sexual reproduction
d. virus that are lytic in nature

Ans: a

4. Which is a brick shaped virus particle?
a. TMV
b. Influenza
c. coliphage
d. bacteriophage

Ans: b

5. the protein covering in virus is known as?
a. capsomere
b. capsid
c. peplomere
d. peplid

Ans: b

6. Which of the folowing has double stranded DNA?
a. Adenovorus
b. Cauliflower M.V.
c. Simian virus
d. all the above

Ans: d

7. Φx174 has which type of genetic material?
a. ss-RNA
b. ss-DNA
c. ds-RNA
d. ds-DNA

Ans: b

8. Which among the following is the character of retrovirus?
a. positively stranded ds-DNA
b. positively stranded ss-RNA
c. negatively stranded ds-DNA
d. negatively stranded ss-DNA

Ans: b

9. Which among the following has a helical symmetry?
a. Turnip Mosaic Virus
b. Potato Mosaic Virus
c. Tobacco Mosaic virus
d. Bacteriophage

Ans: c

10. Which among the following are Biosymmetrical(mixed symmetry)?
a. Turnip Mosaic Virus
b. Reo Virus
c. Tobacco Mosaic virus
d. Bacteriophage

Ans: d

11. Which virus causes Measles?
a. Varicella
b. Variola
c. Lassa
d. Rubeola

Ans: d

12. Which virus causes Chicken-pox?
a. Varicella
b. Rubeola
c. Lassa
d. simian virus

Ans: a

13. Which virus causes Small pox?
a. Varicella
b. Variola
c. Reo Virus
d. Rubeola

Ans: b

14. Which virus is known as Rabies virus?
a. Varicella
b. λ-phage
c. Lassa
d. Rubeola

Ans: d

15. λ-phage has which of the following cycles?
a. Lytic
b. Lysogenic
c. Pinoctic
d. none of the above

Ans: b

16. T-4 Bacteriophage has which of the following cycles?
a. Pinoctic
b. Lytic
c. Lysogenic
d. none of the above

Ans: b

17. Who gave the expression:"Contagium vivum fluidum" to describe a virus?
a. Stanley
b. Pruissner
c. Beijerneick
d. Morris

Ans: c

18. Who discovered interferons?
a. Safferman
b. Morris
c. Issacs and Lindeman
d. Hershey and Chase

Ans:c

19. Who are usually credited with the discovery of AIDS virus?
a. Montagnier and Gallo
b. Gallo and Stanley
c. Pruissner and Lindeman
d. Morris and Gallo

Ans: a

20. What were the contribution of Safferman and Morris in the field of virology?
a. They discovered λ-phages
b. They discovered cyanophages
c. They showed that the infective part is the genetic material.
d. They found out the Lytic cycle of virus reproduction.

Ans: b