Q. No.Fungi can be distinguished from other living organisms by
1. Presence of chitinous cell wall
2. Structure of cell membrane
3. Mode of nutrition
4. Multicellular body organization
1. Presence of chitinous cell wall
2. Structure of cell membrane
3. Mode of nutrition
4. Multicellular body organization
Identify the incorrectly matched pairs:
| I: | Louis Pasteur: Gave the name virus |
| II: | D. J Ivanowsky: Recognized the causal agents of mosaicism in tobacco to be larger than bacteria |
| III: | M. W. Beijerinck : Contagium vivum fluidum |
| IV: | W. M. Stanley: Discovered HIV |
| 1. | I and III |
2. | I and II |
| 3. | III and IV |
4. | II and IV |
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
Which of the following viruses has both DNA and RNA as its genetic material?
| 1. | Retroviruses | 2. | Bacteriophages |
| 3. | Plant viruses | 4. | None |
Viruses are:
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. |
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