Question

virus are exceptions to cell theory. why?

Answer 1

Viruses lack the ability to generate energy on their own, and also generate no waste products, both hallmarks of living organisms. ... This inability to replicate on their own without the presence of a host has lead viruses to traditionally be classified as non-living, and therefore an exception to cell theory.

Answer 2

Virus cannot be easily put into any one group easily. These groups are living and non living. They are non living outside but when they enter into a host. They are considered to be living..