Biology p. 350 1-6

What kind of evidence supports the classification of all organisms into the three-domain system?

It groups organisms primarily based on differences in ribosomal RNA structure. Ribosomal RNA is a molecular building block for ribosomes.

Contrast bacteria with archaea

Archaea and Bacteria are both prokaryotic, but their cellular structures are markedly different, and they have very distinct ribosomal RNA, indicating that these domains diverged a very long time ago, and are largely unrelated.

What is problematic about the kingdom name Archaeabacteria?

The Bacteria and Archea domains have no splitting factor between the domain and kingdom level.

List and briefly describe the kingdoms in the six kingdom system of classification

The first kingdom aligns with the domain Bacteria, the second kingdom aligns with the domain Archaea, and the remaining four Kingdoms align with the domain Eukarya. Bacteria is Unicellular, Archea is Unicellular and less developed, Eukarya is Multicellular and highly developed.

Why do protists, fungi, plants and animals share a single domain in the three-domain system?

They all have a true nucleus, have complex cellular organelles, are large, and Eukaryotic.