Which of the following statements concerning viruses is FALSE?
A. Viruses enter a cell to complete the replication they have begun extracellularly.
B. Some viruses have an outer membrane called an envelope.
C. Viral capsids can assume one of three basic shapes.
D. Viruses never contain both DNA and RNA.
E. Tobacco mosaic virus was the first virus to be discovered and characterized.
Answer: A. Viruses enter a cell to complete the replication they have begun extracellularly.
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