Channel: iBiology

Category: Science & Technology

Tags: carl woeseeukaryotesasgard archaealoki archaeaevolutiontree of lifearchaea16s rrna sequencingprokaryotesmicrobesmicroorganismsendosymbiosisphylogeneticsevolutionary tree

Description: ibiology.org/microbiology/archaea Dr. Dipti Nayak explains how the mysterious microbes known as archaea are helping scientists rewrite the tree of life. Before 1977, all life on Earth was classified into two groups: single-celled microorganisms and complex cellular life such as fungi, plants, and animals. A seminal discovery in 1977 rewrote the tree of life and introduced a whole new domain of organisms known as the archaea - mysterious microbes that are genetically distinct from bacteria. Fast forward to the 21st century, and again new discoveries about archaea are leading scientists to reshape the tree of life and rewrite the evolutionary history of complex organisms. Dr. Dipti Nayak introduces the fascinating organisms known as archaea and explains how they are helping scientists answer the question "Where do we come from?". 0:00 Introduction - Archaea and the Tree of Life 1:49 A New Branch 7:39 A New Tree: Asgard-Loki Speaker Biography: Dipti Nayak received her PhD in Organismic and Evolutionary Biology from Harvard University in 2014. She performed postdoctoral research at the University of Illinois, where she studied the physiology and evolution of methanogenic archaea. The Nayak lab at UC Berkeley employs genetic, genomic, and biochemical tools to study the physiology, metabolism, evolution, and cell biology of methanogenic archaea. mcb.berkeley.edu/faculty/ggd/nayakd Credits: Elliot Kirschner (Wonder Collaborative): Executive Producer Shannon Behrman (iBiology): Executive Producer Brittany Anderton (iBiology): Producer Eric Kornblum (iBiology): Editor, Videographer Derek Reich (ZooPrax Productions): Videographer Adam Bolt (The Edit Center): Editor Gb Kim (Explorer’s Guide to Biology): Illustrations Chris George: Design and Graphics Maggie Hubbard: Design and Graphics