Q. No.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 |
Viruses are:
1. Obligate intracellular parasites
2. Obligate extracellular parasites
3. Facultative parasites
4. Free living, outside a living cell
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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