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Question

The division of the living world into three domains:
  1. Is strictly arbitrary.
  2. Was inspired by the morphological differences between archaea and bacteria.
  3. Emphasizes the greater importance of eukaryotes and was proposed by the early microscopists.
  4. Is strongly supported by data on rRNA sequences.

A
Was inspired by the morphological differences between archaea and bacteria.
B
Emphasizes the greater importance of eukaryotes and was proposed by the early microscopists.
C
Is strongly supported by data on rRNA sequences.
D
Is strictly arbitrary.
Solution
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Carl Woese proposed the three-domain system of classification namely, Archaebacteria, Eubacteria and Eukarya, which were later promoted to domains as archaea, bacteria and eukaryotes. This classification forms the basis of the modern classification which was made by studying the ribosomal RNA genes in these organisms. The organisms were placed in different groups due to the genetic diversity shown by these organisms for the ribosomal genes.
Thus, the correct answer is option D.

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