Enzymes are not found in:
1. Fungi
2. Algae
3. Virus
4. Cyanobacteria

Virus are living, because:
1. They multiply in host cells
2. Carry anaerobic respiration
3. Carry metabolic activity
4. Cause infection

Which disease of man is similar to cattle's, bovine spongiform encephalopathy:

Cauliflower mosaic virus contains:
1.  ss RNA
2.  ds RNA
3.  ds DNA
4.  ss DNA

Viruses are no more "alive" than isolated chromosomes because:

Tobacco mosaic virus is a tubular filament of size:
1.  300 × 10 nm
2.  300 × 5 nm
3.  300 × 20 nm
4.  700 × 30 nm

Which one of the following statements about viruses is correct:
1. Viruses possess their own metabolic system
2. All viruses contain both RNA and DNA
3. Viruses are obligate parasites
4. Nucleic acid of viruses is known as capsid

Viruses that infect bacteria, multiply and cause their lysis are called:

1. Lipolytic

2. Lytic

3. Lysogenic

4. Lysozymes 

Lichens are a well-known combination of an alga and a fungus where the fungus has:
1. An epiphytic relationship with the alga
2. A parasitic relationship with the alga
3. A symbiotic relationship with the alga
4. A saprophytic relationship with the alga