Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 25 - Bacteria, Archaea, and Viruses - 25.4 - Viruses Have Evolved Many Times - 25.4 Recap - Learning Outcomes - Page 549: 2

Answer

One viral origin theory is that some of the DNA viruses represent highly reduced parasitic organisms that have lost their cellular structure over the course of time, along with their ability to reproduce independently of another organism. Another theory is that double-stranded RNA viruses may have descended from single-stranded RNA ancestors.

Work Step by Step

One viral origin theory is that some of the DNA viruses represent highly reduced parasitic organisms that have lost their cellular structure over the course of time, along with their ability to reproduce independently of another organism. Another theory is that double-stranded RNA viruses may have descended from single-stranded RNA ancestors.
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