Discussion
Historically, viruses were first distinguished from bacteria by being
Answer: B
Correct answer: able to pass through filters that retain bacteria
The filterable agents were defined by exclusion: the sap of a diseased tobacco plant remained infectious after passing a filter fine enough to hold back every known bacterium. That single observation, made in the 1890s, established that something smaller than a bacterium could cause disease, and the word virus came to mean it. It also explains the older name filterable agent.
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