BIOL 1108 Edition 1nd Lecture 2 Outline of Last Lecture I Learning Journals A What did I learn today in lecture B One sentence explain why C Every 2 weeks D Use journal guide II In the News A Two peer reviewed articles B Write down two questions points in total C CBE formatting Outline of Current Lecture I Abiogenesis A Definition of abiogenesis the study of how life on Earth might have emerged from non life B Earth formed about 4 4 billion years ago Mantle is heated by radioactive decay in Earth s core Continental drift effects climate C Earth s Atmosphere H2O vapor 80 CO2 10 no free oxygen II For Life to Form Spontaneously A Formation of Organic Molecules B Stanley Miller Experiment C Deep Sea Vents Current Lecture Abiogenesis is the study of how life on Earth might have come to be from nonliving things I History of Life on Earth A Basics 4 4 billion years old Convection currents in fluid cause plates to move continental drift Moving plates cause climate and sea level changes biological evolution and biogeography B Atmosphere These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute II Developed from outgassing in which gases are released from molten rock in the mantle of the planet by volcanic activity Comets and meteorites bring gases Today s atmosphere differs from the past much less H2O vapor and more O2 Overtime the water vapor condensed to make oceans and CO2 dissolved in the oceans Spontaneously Forming Life A Primitive Earth s chemicals had to form organic molecules Molecules had to combine to form primitive cells protocells Protocells had to evolve into true cells B Stanley Miller Experiment Fairly complex organic molecules will form spontaneously under conditions that existed on the primitive earth Energy input from the sun volcanoes and lightning Miller experiments leas to the formation of amino acids under lab conditions simulating a primitive earth atmosphere C Deep Sea vents Demonstrated complex organic compounds such as methane ethane and butane Can be produced via inorganic processes