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What is the defining feature of the domain 'Eukarya'?

Answer and explanation

Correct answer: A membrane-bound nucleus and membrane-bound organelles

Direct answer: B, a membrane-bound nucleus and membrane-bound organelles. Eukarya includes organisms whose cells have a true nucleus enclosed by a nuclear membrane. Their cells may also contain organelles such as mitochondria, endoplasmic reticulum, Golgi bodies, and, in plants and algae, chloroplasts. A is wrong because many eukaryotes, including plants and fungi, have cell walls; therefore wall absence is not the defining universal feature. C is wrong because Eukarya includes unicellular organisms such as many protists as well as multicellular plants, fungi, and animals. D describes prokaryotic organisation and therefore points away from Eukarya. Memory cue: “eu” means true; Eukarya have a true, membrane-bound nucleus.

Related tags

EukaryaCell StructureMembrane-Bound NucleusCell OrganellesBiological ClassificationBiodiversityAnd Classification SystemsBiodiversity And Classification SystemsThe Living World

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