It is true for viruses:
Correct answer: D. Independent metabolic activities.
- A. Viruses contain only RNA
- B. Viruses are cellular
- C. Tiny and infectious agent
- D. Independent metabolic activities.
Explanation
Viruses are tiny infectious agents that lack many of the key characteristics of living things. They cannot reproduce on their own, as they must infect a host cell to multiply. They have no metabolism and cannot produce energy or synthesize proteins. Unlike cells, viruses lack cellular structure and consist only of nucleic acids (either DNA or RNA, never both) enclosed in a protein coat. They are the smallest infectious agents, visible only under an electron microscope, and rely entirely on host cells for replication.
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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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