Correct answer: (B) Ribosomal RNA of the small ribosomal subunit
Explanation
Small-subunit ribosomal RNA, specifically 16S rRNA in prokaryotes, combines conserved regions with informative sequence variation and is broadly comparable across organisms. Woese’s rRNA comparisons established major evolutionary relationships, including the distinction of archaea. Select B; the marker is RNA of the small subunit, not a ribosomal protein.
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