A fungus used extensively in biochemical and genetic work is:

Contagium vivum fluidum was proposed by

In general, the viruses that infect plants have:

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 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

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

Potato Spindle Tuber Disease is caused by a pathogen that is:

Prion is:
1. A nucleocapsid
2. A low molecular weight free RNA
3. An abnormally folded protein
4. A protozoan

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