It is thought that viruses may have originated from cells because
A) of their small size.
B) they are pathogens.
C) they can only replicate within a host cell.
D) they do not have organelles.
E) more than one of these.

Question

Quizplus · Accepted Answer

Viruses can only replicate within a host cell, which suggests that they have evolved from cells that were able to do so. Both prokaryotic and eukaryotic cells are able to replicate, so it is possible that viruses originated from either type of cell. Therefore, choice C is the best answer.

It Is Thought That Viruses May Have Originated from Cells