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In Carl Woese's three-domain system, kingdom Monera is divided into how many domains?

Answer and explanation

Correct answer: Two

Correct answer: B, two. In the older five-kingdom arrangement, Monera was treated as one kingdom containing prokaryotic organisms. Carl Woese’s molecular classification showed that these organisms are not one uniform group. They are separated into two domains: Archaea and Bacteria. The third domain, Eukarya, contains organisms with eukaryotic cells and does not come from dividing Monera. A is incorrect because Monera is not retained as a single domain in Woese’s system. C is incorrect because three is the total number of domains in the complete system, not the number formed from Monera. D is incorrect because Monera is not divided into four domains. Memory cue: “Monera splits into A + B”—Archaea plus Bacteria; Eukarya is the third domain outside that split. The division reflects important molecular and cellular differences between archaeans and bacteria.

Related tags

MoneraThree-Domain SystemArchaeaBacteriaClassificationBiodiversityAnd Classification SystemsBiodiversity And Classification SystemsThe Living World

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