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Q. No.Which of the following statements is correct?
1. Lichens do not grow in polluted areas.
2. Algal component of lichens is called mycobiont.
3. Fungal component of lichens is called phycobiont.
4. Lichens are not good pollution indicators.
Identify the incorrect statement regarding viruses:
| 1. | A virus is a nucleoprotein and the genetic material is infectious |
| 2. | Retroviruses contain both RNA and DNA |
| 3. | Viruses are obligate cellular endoparasites |
| 4. | Viruses can be crystallized and this was first shown by W. M Stanley |
Regarding viroids:
| I: | They are small single-stranded, circular RNAs that are infectious pathogens. |
| II: | The first recognized viroid was the Potato spindle tuber viroid, abbreviated PSTVd. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I. | He studied the tobacco mosaic virus. |
| II. | He succeeded in extracting the virus in the form of pure crystals in 1935. |
| III. | He was able to show that the tobacco mosaic virus is composed of protein and RNA. |
| 1. | D. J. Ivanowsky | 2. | W. M. Stanley |
| 3. | M. W. Beijerenik | 4. | Louis Pasteur |
Which of the following statements is incorrect?
1. Prions consist of abnormally folded proteins
2. Viroids lack a protein coat
3. Viruses are obligate parasites
4. Infective constituent in viruses is the protein coat
Identify the incorrect statement regarding viroids:
1. Viroids are the smallest infectious pathogens known.
2. They are composed solely of a short strand of circular, single-stranded RNA that has no protein coating.
3. The first recognized viroid, the pathogenic agent of the potato spindle tuber disease, was discovered by Theodor Otto Diener.
4. The nucleic acid of viroids codes for only a few proteins.
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Which disease of man is similar to cattle's, bovine spongiform encephalopathy:
| 1. | Encephalitis | 2. | Jacob-Creutzfeldt disease |
| 3. | Spongiocitis of cerebrum | 4. | Spondylitis |
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- 1(current)
Q. No.
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