Approximately _____ species of bacteria are known to cause diseases in humans.
Correct answer: B. 200
- A. 100
- B. 200
- C. 300
- D. 400
Explanation
Standard introductory microbiology texts commonly state that about 200 bacterial species are known to cause disease in humans. A student may select 100 or 300 because the figure is approximate, but 200 is the conventional estimate used in this classification context.
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About Prokaryotic and Eukaryotic Cells
Prokaryotic cells lack a membrane-bound nucleus and complex membrane-bound organelles, whereas eukaryotic cells contain a nucleus, specialized organelles and a cytoskeleton. Comparisons include DNA organization, ribosomes, cell walls, size, division and examples such as bacteria, archaea, protists, fungi, plants and animals.
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