Q. No.Viruses are non-cellular organisms, but replicate themselves once they infect the host cell. To which of the following kingdom do viruses belong to?
1. Monera
2. Protista
3. Fungi
4. -None of these
Virus are living, because:
1. They multiply in host cells
2. Carry anaerobic respiration
3. Carry metabolic activity
4. Cause infection
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 |
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
Given below is the diagram of a bacteriophage. In which one of the options, all the four parts A, B, C and D are correct?
| A | B | C | D | |
| 1. | Sheath | Collar | Head | Tail fibres |
| 2. | Head | Sheath | Collar | Tail fibres |
| 3. | Collar | Tail fibres | Head | Sheath |
| 4. | Tail fibres | Head | Sheath | Collar |
Contagium vivum fluidum was proposed by
1. DJ lvanowsky
2. MW Beijernek
3. Stanley
4. Robert Hook
Which of the following statements is incorrect?
| 1. | Prions consist of abnormally folded proteins |
| 2. | Viroids lack a protein coat |
| 3. | Viruses are obligate parasites |
| 4. | Infective constituent in viruses is the protein coat |
Which of the following shows coiled RNA strand and capsomeres?
| 1. | Poliovirus | 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
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