Viruses are __________ smaller than bacteria?
Correct answer: B. 10 - 1000 times
- A. 10 - 100 times
- B. 10 - 1000 times
- C. 100 - 1000 times
- D. 1000 - 10000 times
Explanation
Viruses commonly measure about 20 to 300 nm, whereas bacteria are roughly 0.5 to 5 micrometres, or 500 to 5000 nm. Comparing these ranges gives a size difference that can extend from about 10 times to about 1000 times, so option b is the broad textbook range. Students may choose a because it describes the difference for many common virus and bacterium comparisons but is too narrow.
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