Which one of the following statements about viruses is correct?
Correct answer: B. Viruses contain either DNA or RNA
- A. Viruses possess their own metabolic system
- B. Viruses contain either DNA or RNA
- C. Viruses are facultative parasites
- D. Viruses are readily killed by antibiotics
Explanation
The correct statement about viruses is that they contain either DNA or RNA as their genetic material, but never both, which is essential for their classification and replication. The other statements are incorrect. Viruses are not readily killed by antibiotics because antibiotics target bacterial cellular processes that viruses lack. They are also not facultative parasites; instead, they are obligate intracellular parasites, meaning they cannot reproduce or carry out life processes outside a host cell. Additionally, viruses do not possess their own metabolic system and entirely depend on the host cell's machinery for energy and replication. Thus, the presence of DNA or RNA is the defining feature of viruses.
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About Biodiversity and Variety of Life
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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