Nutritionally Viruses are__________?
Correct answer: A. Obligate parasite
- A. Obligate parasite
- B. Autotrophs
- C. Heterotrophs
- D. Absorptive heterotrophs
Explanation
Viruses are obligate parasites because they lack the cellular machinery needed for independent metabolism and reproduction, so they must use a living host cell. Students may choose heterotrophs because viruses obtain materials from hosts, but heterotrophy describes cellular organisms that feed on organic matter, whereas viruses are acellular.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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