Which one of the following organisms is not an example of eukaryotic cell?

1. Escherichia coli

2. Euglena viridis

3. Amoeba proteus

4. Paramecium caudatum

Which one of the following is wrongly matched?

Single-celled eukaryotes are included in 

Infectious proteins are present in

1. gemini viruses

2. prions

3. viroids

4. satellite viruses

T. O. Diener discovered a

1. free infectious RNA

2. free infectious DNA

3. infectious protein

4. bacteriophage

Cell wall is absent in

1. Aspergillus

2. Funaria

3. Mycoplasma

4. Nostoc

Which of the following shows coiled RNA strand and capsomeres?

1. Polio virus

2. Tobacco mosaic virus

3. Measles virus

4. Retrovirus

Viruses have

1. DNA enclosed in a protein coat

2. prokaryotic nucleus

3. single chromosome

4. Both DNA and RNA

The imperfect fungi which are decomposers of litter and help in mineral cycling belong to

1. Deuteromycetes

2. Basidiomycetes

3. Phycomycetes

4. Ascomycetes

Select wrong statement.

1. The viroids were discovered by D.J. lvanowsky.

2. W.M. Stanley showed that viruses could be crystallized.

3. The term 'contagium vivum fluidum' was coined by M.W. Beijerinck.

4. Mosaic disease in tobacco and AIDS in human being are caused by viruses.