Which statement correctly explains why viruses are not classified as living organisms?

Which statement correctly explains why viruses are not classified as living organisms?

• A. They cannot reproduce unless they infect living cells
• B. They can reproduce on their own in host tissue
• C. They have independent metabolism
• D. They do not contain genetic material

Answer: (A)

Viruses aren’t considered living because they can’t carry out the basic functions of life on their own. They lack the cellular machinery and metabolic processes needed to reproduce or metabolize energy, so they must hijack a living host cell to copy their genetic material and produce new viral particles. This dependence on infecting and using a host cell is the defining reason they’re not classified as living. The other ideas don’t fit because viruses do contain genetic material (DNA or RNA), they do not reproduce independently outside a host, and they do not have their own independent metabolism. So the statement that captures why viruses aren’t living is that they cannot reproduce unless they infect living cells.

Viruses aren’t considered living because they can’t carry out the basic functions of life on their own. They lack the cellular machinery and metabolic processes needed to reproduce or metabolize energy, so they must hijack a living host cell to copy their genetic material and produce new viral particles. This dependence on infecting and using a host cell is the defining reason they’re not classified as living. The other ideas don’t fit because viruses do contain genetic material (DNA or RNA), they do not reproduce independently outside a host, and they do not have their own independent metabolism. So the statement that captures why viruses aren’t living is that they cannot reproduce unless they infect living cells.