BIOLOGY 1B Study Guide - Comprehensive Final Exam Guide - Photosynthesis, Oxygen, Bacteria
Document Summary
Earth became as a physical system, in which biological systems didn"t exist. After the earth cooled, life originated on earth. Early atmosphere c02, nitrogen, h20 (vapor) Volcanic activity methane, hydrogen sulfide, ammonia. Earth is being pelted by comets of ice that generate heat. Stromatolites -- dominated ancient earth 3. 5 billion years ago, layers of materials laid down by prokaryotes, type of construction from a biofilm. Biofilm -- prokaryotes that adhere to a surface, bind to a surface, and create a community in which they have complex chemical signaling, rely on sun for energy for photosynthesis to grow in upward direction, create layers. Human microbiome -- community of organisms living on and within you. About the same number of cells of other organisms live in/on you as the cells in your body. Bacteria in clouds use hail to sample what is going on in the sky. Domains -- bacteria, archaea, eukarya (phylogenetic term -- evolutionary biology)
