How is the structure of a virus different from the structure of a prokaryotic cell?

Viruses are collectively classified as "non-living"; unlike prokaryotic cells. This is because:
+ Viruses do not have a cellular organization.
  -This means that they cannot perform metabolic activities without a host cell, unlike prokaryotes.
+ Viruses are approximately 50 times smaller than prokaryotes.
+ When taking into consideration genetic material, viruses can either have DNA or RNA, whereas prokaryotes have DNA as their genetic composition.
+ Viruses can proliferate and have the capability of affecting other microorganisms.