All the above are characteristics of viruses except viral diseases are curable (Option d). Moreover, viruses are considered to be nonliving because they do NOT show all the characteristics of life (Option d).
- Viruses are considered to be nonliving because they cannot live in absence of host cells, i.e., they are obligate parasites.
- In consequence, viruses need to have a suitable host cell to carry out their metabolic functions (i.e., reproduce and growth).
- Moreover, for most viral infections, treatments only can help to alleviate disease symptoms while the immune system fight against the virus.
In conclusion, all the above are characteristics of viruses except viral diseases are curable (Option d). Moreover, viruses are considered to be nonliving because they do NOT show all the characteristics of life (Option d).
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