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The porcelain Chamberland-Pasteur filter opened the way to the discovery of viruses. What did it do to a liquid sample?
ARemoved every dissolved mineral salt
BRemoved every bacterium visible by microscope
CRemoved all water and left a dry residue
DRemoved every protein larger than a capsid
Answer & Solution
Correct answer: B. Removed every bacterium visible by microscope
1. The Chamberland-Pasteur filter is a porcelain filter used on liquid samples.
2. It removes all bacteria that are visible in the microscope from that liquid.
3. Anything infectious still left in the filtrate therefore cannot be a visible bacterium, which is how filterable agents were found.
4. Salts, water and small proteins pass straight through, so none of those is what the filter takes out.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 21 "Viruses", section 21.1 Viral Evolution, Morphology, and Classification_
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