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PHOTOSYNTHESIS. Getting energy to live. Baby heterotroph!. Heterotrophs must consume organic molecules for energy. Cellular respiration. Autotrophs produce their own food molecules Photosynthesis Cellular respiration. Autotroph. Capturing the Energy in Light.
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Getting energy to live Baby heterotroph! • Heterotrophs must consume organic molecules for energy. • Cellular respiration. • Autotrophs produce their own food molecules • Photosynthesis • Cellular respiration Autotroph
Capturing the Energy in Light • Photosynthesis is an example of a biochemical pathway. • Captures light energy. • Stores energy in form of chemical bonds. • Chemical bonds are in organic compounds.
Light Absorption in Chloroplasts • Chloroplasts are the structures that capture light. • Photosynthesis Reactions takes place in the chloroplasts. • Chloroplasts were once free living. (Pair share: just like…) Structure of a Chloroplast
Chloroplast structure • Chloroplasts are composed of: • Double membrane. • Thylakoids. • Grana • Stroma Structure of a Chloroplast
Energy For Life Processes • Photosynthesis • Raw materials are water and carbon dioxide. • Products are glucose and oxygen. • Energy source is sunlight.
A series of biochemical pathways • There are 2 main biochemical pathways • light dependent • Uses electrons “excited” by sunlight for energy • has 2 phases: photosystems 1 & 2 • Takes place in thylakoid • light independent (Calvin cycle). • Uses ATP & NADPH for energy to make glucose • Takes place in the stroma Diagram of the phases of photosynthesis
Cyclical processes • Photosynthesis and cellular respiration form a cycle. • Carbon dioxide & water • Oxygen & glucose • Heterotrophs • Autotrophs Photosynthesis - respiration cycle