Which is NOT an example of a microbial symbiosis?
Correct answer: C. bacteria passing through the placenta
- A. bacteria in the human colon
- B. tapeworm in the cow intestine
- C. bacteria passing through the placenta
- D. protozoans found within termites
Explanation
Bacteria in the colon and protozoans in termites can have mutually beneficial associations, while a tapeworm lives as a parasite in the cow intestine. Bacteria passing through the placenta describes transmission rather than a symbiotic association, so option c is the exception. Students may choose the tapeworm because it is harmful, overlooking that parasitism is also a type of symbiotic interaction.
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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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