In 1971, T.O. Diener discovered a new infectious agent that was smaller than viruses –
I. | It causes potato spindle tuber disease. |
II. | It is free RNA. |
III. | Molecular wt. of RNA is low. |
The above statements are assigned to –
1. Viruses
2. Viroids
3. Virulent
4. Mycoplasma
Which of the following statement is incorrect?
a. Viroids are smaller than viruses.
b. Viroid was found to be a free RNA.
c. The RNA of the viroid is of high molecular weight.
d. In 1971, T.O. Diener discovered it.
Lichens, viruses, viroids and prions have been included in the kingdom –
a. Monera
b. Protista
c. Plantae
d. None of the above
Which of the following disease is not caused by Prions?
a. Bovine spongiform encephalopathy (BSE) in cattles
b. Cr–Jacob disease (CJD) in humans.
c. Mad cow disease in cattle
d. Potato Spindle Tuber disease
Viroids have
(1) single stranded RNA not enclosed by protein coat
(2) single stranded DNA not enclosed by protein coat
(3) double straded DNA enclosed by protein coat
(4) double stranded RNA enclosed by protein coat
Which of the following pathogenic disease could have the symptoms like mosaic formation, leaf rolling and curling, yellowing and vein clearing, dwarfing and stunted growth?
a. Viral
b. Bacterial
c. Fungal
d. Deficiency syndrome.
Match the columns.
Column I | Column II |
(a) Prion (b) Bacteriophage (c) Plasmid (d) Virus |
(p) Nucleic acid + Protein (q) Infectious protein (r) Bacterial DNA (s) Infect bacteria |
Select correct option
1. a-p, b-q, c-r, d-s
2. a-s, b-r, c-q, d-p
3. a-q, b-s, c-r, d-p
4. a-q, b-s, c-p, d-r
Which of the following statements is wrong for viroids?
(1) They are smaller than viruses
(2) They cause infections
(3) Their RNA is of high molecular weight
(4) They lack a protein coat
Which of the following shows coiled RNA strand and capsomeres?
(1) Polio virus
(2) Tobacco mosaic virus
(3) Measles virus
(4) Retrovirus
Which of the following is not correctly matched?
1. | Inert Crystals - Virus | 2. | Free RNA - Viroids |
3. | Normal protein - Prions | 4. | Symbionts - Lichen |