Prokaryotic single-celled organisms, the ancestors of modern-day bacteria and archaea, are the most ancient form of life on our planet, first appearing roughly 3.5 billion years ago. The first ...

Prokaryotes are ancient, simple forms of life that include bacteria and archaea. These cellular life forms lack membrane-bound organelles. Those organelles, which include the nucleus and the ...

W. Ford Doolittle is a Fellow of the Canadian Institute for Advanced Research and professor of biochemistry at Dalhousie University, Halifax, Nova Scotia. James R. Brown is a postdoctoral fellow in ...

We tend to view ourselves and the complex cells that build us as a distinct branch of the tree of life from the compact, seemingly featureless cells of bacteria and archaea. But we’ve found that our ...

An international collaboration between four scientists from Mainz, Valencia, Madrid, and Zurich has published new research in the Proceedings of the National Academy of Sciences, shedding light on the ...

What is the last common ancestor of all plants and animals? Where did complex life come from and when? Scientists have been trying to answer these questions for many years. A new finding has changed ...

All cells in animals, plants, fungi, and protists share a fundamental characteristic, in that they are eukaryotic cells. These are essentially complex cells with specialized internal compartments. The ...

Approximately four billion years ago, the first forms of life emerged on Earth. For eons, biological life consisted of prokaryotic organisms, either early bacteria or archaea. Determining when ...

Back 2.8 billion years ago, while Earth shifted its plates to make new continents and violent volcanoes produced new crust, life crafted a novel invention of its own. 1,2 At first, the nucleus was ...