Which one of the following statements about viruses is correct:
- Viruses possess their own metabolic system
- All viruses contain both RNA and DNA
- Viruses are obligate parasites
- Nucleic acid of viruses is known as capsid
The Correct Option is C
Solution and Explanation
Viruses are obligate parasites because they cannot carry out metabolic processes or reproduce independently. They rely on the cellular machinery of a host organism to replicate and propagate. Viruses are essentially genetic material (either DNA or RNA) enclosed in a protein coat, which is called a capsid (option D is incorrect). Option A is incorrect because viruses lack their own metabolic systems, and option B is incorrect because not all viruses contain both RNA and DNA; they can have one or the other as their genetic material.
So, the correct option is (C): Viruses are obligate parasites
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Viruses and Subviral Particles
- Viruses are not the only submicroscopic bodies capable of causing disorders within cells.
- Sub-viral particles are infectious agents that bear a resemblance to viruses in structure and composition. But they are notably smaller and simpler than viruses but lack either nucleic acid or protein and are thus not viruses. (Thus they may be proteins beyond nucleic acids or only nucleic acids beyond protein coat /capsid.)
- There are 3 sub-viral agents.
- Prions
- Viroids
- Virusoids