A fungus used extensively in biochemical and genetic work is:

1. Neurospora 2. Trichoderma
3. Paecilomyces 4. Streptomyces
Subtopic:  Kingdom Fungi: Ascomycetes | Kingdom Fungi: Basidomycetes | Mycorrhiza | Virus, Viroids & Prions |
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Contagium vivum fluidum was proposed by

1. D. J. Ivanowsky 2. M. W. Beijerinek
3. Stanley 4. Robert Hooke
Subtopic:  Virus, Viroids & Prions |
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In general, the viruses that infect plants have:

1. Single stranded RNA 2. Single stranded DNA
3. Double stranded RNA 4. Double stranded DNA
Subtopic:  Virus, Viroids & Prions |
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Viruses are:
1. Obligate intracellular parasites
2. Obligate extracellular parasites
3. Facultative parasites
4. Free living, outside a living cell

Subtopic:  Virus, Viroids & Prions |
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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

Subtopic:  Virus, Viroids & Prions |
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Which of the following statements is wrong for viroids?
1. Their RNA is of high molecular weight
2. They lack a protein coat
3. They are smaller than viruses
4. They cause infections

Subtopic:  Virus, Viroids & Prions |
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Viroids differ from viruses in having
1. DNA molecules with protein coat
2. DNA molecules without protein coat
3. RNA molecules with protein coat
4. RNA molecules without protein coat

Subtopic:  Virus, Viroids & Prions |
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Potato Spindle Tuber Disease is caused by a pathogen that is:

1. A nucleocapsid
2. A low molecular weight free RNA
3. An abnormally folded protein
4. A protozoan
Subtopic:  Virus, Viroids & Prions |
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Prion is:
1. A nucleocapsid
2. A low molecular weight free RNA
3. An abnormally folded protein
4. A protozoan

Subtopic:  Virus, Viroids & Prions |
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The disease caused by prions in humans is known as:
1. Bovine spongiform encephalopathy
2. Scrapie
3. CJD [Creutzfeldt Jakob Disease]
4. Infectious mononucleosis

Subtopic:  Virus, Viroids & Prions |
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