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Overview of Cellular Respiration PGS. 131-134 Review of Photosynthesis Step 1: Light Reaction •Light is absorbed by chlorophyll in the photocenters. •Water molecules are split in the ETC. This produces: • i. H+ and electrons (e-) • ii. Oxygen gas is released • iii. ATP and NADPH are made Step 2: Calvin Cycle •This reaction uses: • ATP and NADPH from the Light Reaction and CO2 from the atmosphere •The product is glucose (C6H12O6) What happens to the glucose? •Some will be used for energy for the plant •The unused (excess) will be stored as starch (ex: potatoes) Cellular Respiration •Using glucose to produce ATP for cells •Occurs in the cytoplasm and mitochondria Cellular Respiration Overall Equation: C6H12O6 + 6O2 6CO2 + 6H2O + ATP Energy ***Memorize this equation*** Two Types of Cellular Respiration 1. Aerobic: needs O2; produces 38 ATP’s for each glucose molecule. • Type of respiration most organisms use Two Types of Cellular Respiration 2. Anaerobic: does NOT need O2, produces 2 ATP’s for each glucose molecule. • Bacteria living in environments with no O2 • Yeast undergoing fermentation • Muscles that have a lack of oxygen, also produces lactic acid which causes sore muscles Question If an organism lived in an O2 deficient environment it would undergo the _____________ pathway.