Q. No.Viruses are:
1. Obligate intracellular parasites
2. Obligate extracellular parasites
3. Facultative parasites
4. Free living, outside a living cell
1. Obligate intracellular parasites
2. Obligate extracellular parasites
3. Facultative parasites
4. Free living, outside a living cell
Bacteriophages are:
| 1. | Bacteria infecting ss RNA viruses |
| 2. | Bacteria infecting ds RNA viruses |
| 3. | Viruses that infect bacteria and generally have ds DNA |
| 4. | Viruses that infect bacteria and generally have ds RNA |
Which of the following is not a viral disease?
| 1. | Influenza | 2. | Yellow fever |
| 3. | Japanese encephalitis | 4. | Kala azar |
Methanogens are commonly present in:
1. Alimentary canal of the lower invertebrates
2. Symbiotic relationships with xerophytic plants
3. Gut of ruminant animals
4. Close associations with corals
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. |
If you are told that the given diagram shows a single ‘super cell’ that can ‘move’, you would conclude that this must be:
1. A plasmodial slime mould
2. A pathogenic fungus
3. A coenobium of an alga
4. A bioluminescent dinoflagellate
Identify the incorrect statement regarding Eubacteria:
| 1. | Cyanobacteria can fix atmospheric nitrogen in specialized cells called heterocysts |
| 2. | Chemosynthetic autotrophic bacteria play a great role in recycling nitrogen and phosphorus |
| 3. | Heterotrophic bacteria are the only bacteria that do not include any economically useful microbe for humans |
| 4. | Mycoplasma lack cell wall and can survive without oxygen |
Which of the following viruses has both DNA and RNA as its genetic material?
| 1. | Retroviruses | 2. | Bacteriophages |
| 3. | Plant viruses | 4. | None |
A ‘dikaryon’ stage is seen in the members of:
1. Ascomycetes and Phycomycetes
2. Ascomycetes and Basidiomycetes
3. Basidiomycetes and Phycomycetes
4. Basidiomycetes and Deuteromycetes
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