Please take out Breeding Bunnies Lab to turn

 Please take out Breeding Bunnies Lab to turn

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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