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:
1. | Encephalitis | 2. | Jacob-Creutzfeldt disease |
3. | Spongiocitis of cerebrum | 4. | Spondylitis |
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:
1. | They require both RNA and DNA |
2. | They both need food molecules |
3. | They both require oxygen for respiration |
4. | Both require the environment of a cell to replicate |
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