Planctomycetes challenge our concept of the bacterial cell and of a prokaryote as a cell structure type, as well as our ideas about origins of the eukaryote nucleus. Planctomycetes Are Important ...

A eukaryote is any cell or organism that possesses a clearly defined nucleus. Eukaryotic cells form the foundation of complex, multicellular life, including apple trees, mushrooms, fish and humans.

(A-D) Models that propose the origin of a nucleus-bearing but amitochondriate cell first, followed by the acquisition of mitochondria in a eukaryotic host. (E-G) Models that propose the origin of ...

“This is the most exciting and important paper on big questions about eukaryotic origins and the tree of life in years,” said evolutionary biologist Jeffrey Palmer of Indiana University, Bloomington, ...

The researchers found that the DNA contained sequences of archaea, algae (eukaryote) and bacteria that hosted 3,700 potential viruses - about two-thirds were giant viruses that aren't known to ...

Scientists have found the remnants of genomes left by ancient, giant viruses within the DNA of a single-celled organism with which complex organisms like ourselves share a common ancestor.