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What was the basis for dividing living organisms into three domains?

Answer and explanation

Correct answer: Comparison of 16S rRNA gene sequences

Correct answer: A, comparison of 16S rRNA gene sequences. Carl Woese and colleagues compared molecular differences in ribosomal RNA, especially 16S rRNA in prokaryotic lineages. These comparisons revealed deep evolutionary relationships and supported three domains: Bacteria, Archaea and Eukarya. A gene sequence is useful because it records inherited molecular differences, not merely an outward appearance. B is wrong because body size can vary within related groups and is not a reliable measure of deep ancestry. C is wrong because wall thickness is only one structural feature and does not establish the three-domain relationships. D is wrong because nutritional habits may be shared by unrelated organisms. Memory cue: three domains—Woese—ribosomal RNA; the molecular evidence is the key.

Related tags

Three-Domain System16S RrnaCarl WoeseBiological ClassificationBiodiversityAnd Classification SystemsBiodiversity And Classification SystemsThe Living WorldBiology

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