Eukaryotes are thought to have originated through a process known as endosymbiosis, in which an ancestral prokaryotic cell engulfed another, forming a mutually beneficial relationship. Over time, the ...

Scientists propose that the eukaryotic branch of this family tree formed when two prokaryotes, an ancient bacterium and archaeal cell, merged, forming a symbiotic relationship maintained over time. 1 ...

Most organisms require nitrogen to produce biological molecules, such as nucleotides and amino acids, but until recently, only prokaryotes were known to ... that UCYN-A divided in synchrony with other ...

The twilight zone is an important depth of the ocean where particulate organic matter (POM) remineralization takes place, and prokaryotes contribute to more than 70% of the estimated remineralization.