LIFESCI 1 Lecture Notes - Lecture 2: Eukaryote, Ecological Relationship, Prokaryote
Document Summary
With or without a nucleus: no = prokaryote (1st cell from 4 billion years ago, yes = eukaryote (evolved 2 billion years ago, prokaryotes. Descendants are bacteria, found wherever there is life. Success depends on size, ability to reproduce rapidly, obtains energy from many sources. Some can be multi-cellular (but not often: eukaryotes. Can be single-celled microorganisms called protists (ex. Cells in multicellular organisms = specialize to perform different functions. Includes animals, plants, fungi: 3 domains of life (bacteria, archaea, and eukarya) Archaea = single celled organisms only; flourish in hostile conditions. Eukarya and archaea are more closely related than bacteria and. Archaea: essential feature of a cell = 3) harness energy from environment. Organisms acquire energy from the sun and chemical compounds. All nutrients are broken down with chemical reactions, releasing energy, and storing it as atp (adenosine triphosphate) = metabolism. Viruses: not cells because they can"t harness energy from the environment.
