NEET : Multiple Choice question- Virus, Viroids, Prions

1.Which of the following statement is not  correct.

A.  Virus is non cellular structure, may found 9n form of cystal out the living cell.

B.Term virus has been taken from the word venom by Jenner.   

C.  Virus uses the system of host cell and start to replicate with in host cell

D.  Virus are smaller than bacteria because they can pass bacteria proof filters.

Answer : B Explanation 

2. Dmitri Ivanowsky  discovered virus which were causing

A. Spindle tuber disease

B. Late blight of Potato

C. Loose smut of wheat.

D. Tobacco Mosaic disease.

Answer: D Explanation 

 

3. M.W. Beijerineck used term "Contagium vivum fluidium" for 

A. Infected fluid of virus

B. Naked genetic material 

C. Infected protein coat.

D. Infected fluid exist in various disease.

Answer: A Explanation 

4.Who of the following crystallises virus particle out side the living cell.

A. Louis Pasteur

B. M.W. Beijerineck 

C. W.M. stanley

D. Dmitri Ivanowsky 

Answer: C Explanation 

5. How many statement is /are correct .

1. Virus is obligate parasite. 

2. Viral protein coat is called capsomere which is made up of small unit capsid.

3. Capsomere are hellically or  polyhedral geometrically arranged.

4. Virus has  both DNA and RNA. 

5. Virus containing double stranded RNA generally causes disease in plants.

A. Two         B. Four 

C. Three       D. Five 

Answer: A Explanation 

6. Virus that causes disease in animal including human  have 

A. Single stranded DNA

B. Double stranded RNA

C. Double stranded DNA

D. All of the above.

Answer : D Explanation 

7. Virus that causes disease in plants   have 

A. Single stranded DNA

B. Double stranded RNA

C. Double stranded DNA

D. All of the above.

Answer : A  Explanation 

8. Which of the following pair of disease is not caused by the virus.

A. Pneumonia and Typhoid

B. Small pox and Herpes

C. Mumps and influenza 

D. All of the above. 

Answer: A Explanation 

9. Consider the following symptoms in plants of viral disease and select the correct code;

1. Leaf curling 

2. Leaf rolling 

3. Vein clearing

4. Yellowing of leaf

A. 1,2  and 3 

B. 2, 3  and 4

C. 1,3 and 4

D. 1, 2,3 and 4 

Answer: D Explanation 

 10. Consider the following statement and select the correct code:

1. T.O. Dienier discovered viroids.

2. He discovered this infectious agent from spindle tuber disease of potato.

A. Only 1   B. Only 2 

C. Neither 1 nor 2

D. Both 1 and 2 

Answer: D Explanation 

11. Which of the following statement is not correct for the viroids.

A. Viroids is smaller than virus.

B. It has infectious genetic material only

C. It is devoid of protein coat.

D. Its RNA has high molecular weight.

Answer: D Explanation 

12. Which of the following infectious agent causes neurological diseases.

A. Virus     B. Viroids

C. Prions    D. Bacteria

Answer : C Explanation 

13. Bovine Spongiform encephalopathy or mad cow disease in cattle is caused by 

A. Bacteria    B. Virus 

C. Virouds      D. None of the above

Answer: D Explanation 

14. How many statement is / are correct.

1. Prions are folded infectious protein.

2. The size of prions is small than virus.

3. Prions has RNA or DNA.

4. Cr Jacob disease in human is caused by variant of prions.

A. One       B. Two 

C. Three    D. Zero

Answer: B Explanation