A virus is composed of:
Correct answer: C. Nucleic acid and protein coat
- A. Only proteins
- B. Only nucleic acids
- C. Nucleic acid and protein coat
- D. Nucleic acid, protein coat, lipid envelope
Explanation
A virus is not made of proteins alone (a) or nucleic acids alone (b). Its basic structure always includes nucleic acid surrounded by a protein coat, the capsid (c). However, some viruses also possess an outer lipid envelope derived from the host cell membrane, making the most complete answer (d): viruses are composed of nucleic acid, a protein coat, and sometimes a lipid envelope.
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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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