Please take out Breeding Bunnies Lab to turn in Take out a half sheet of paper for a warm up Have your notebook turned to page 106 for the notes for today: Origin of Life
Brain Checkpoint 1. How many lobes are in the Cerebrum 2. What are the three major parts of the brain 3. What lobe is structure C? A
B C Page 106 Just write the red lettering into your
notebook. Universe formed 15 billion years ago (Big Bang) Galaxies formed from stars, dust and gas Earth formed 4.6 billion years ago Suns energy stripped away 1st atmosphere
2nd atmosphere formed from volcanic outgassing Primitive atmosphere: Mostly CO2, water vapor, No Oxygen, very hot, lots of lightening
lesser amounts of CO, N2, H2, HCl, and traces of NH3 and CH4 (3.5 bya) Formation of Earths Oceans Condensation
Rain Oceans formed from off gassing of water vapor from volcanoes and meteorites with ice.
O2 came in 1.5 bya from photosynthesis Present atmosphere: 78% N2, 21% O2, 0.04% CO2, + trace gasses Miller & Urey (1953)- Organic Molecule Theory - mixed
water vapor, NH3, CH4, H2+ electric spark amino acids and other organic compounds electrodes CH4 NH3 H2 water vapor
spark condenser boiling water
water containing organic compounds Produced: 20 amino acids Several sugars Lipids
Purine and pyrimidine bases (found in DNA, RNA & ATP) Life began~ 3.5 bya Organic molecules (C H O N P S) swimming in shallow seas
Stage 1: Abiotic synthesis of organic molecules such as proteins, amino acids and nucleotides Stage 2: joining of small molecules (monomers) into large molecules
Stage 3: origin of self-replicating molecules that eventually made inheritance possible Stage 4: packaging these molecules into pre-cells, droplets of molecules with membranes that maintained an internal
chemistry Hydrothermal Vent Theory At the bottom of the ocean, chimneys of very hot material under immense pressure combined to make inorganic material that then formed into macromolecules and then
life. Meteorite Theory Rocks containing bacteria and other organic molecules survived impact and seeded the planet with life.
Endosymbiotic Theory Endo= inside Symbiotic=mutually beneficial Idea that mitochondria and chloroplasts came from engulfing prokaryotic cells
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