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Photosynthesis and Cellular Respiration
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Photosynthesis and Cellular respiration Both pathways have to do with the gathering and storing of energy to sustain life in living things. 6CO 2 + 6H 2 O + energy → C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O + energy
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ATP Adenosine Triphosphate One of the principal chemical compound that cells use to store and release energy is ATP (chemical energy) Energy stored in cells: ADP ATP Energy released in cells: ATP ADP Cells generate ATP/ADP as needed by using energy in foods like glucose
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ATP ATP is like a charged up battery ADPATP Energy Adenosine diphosphate (ADP) + PhosphateAdenosine triphosphate (ATP) Partially charged battery Fully charged battery
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PHOTOSYNTHESIS In photosynthesis, energy is captured from sunlight by chloroplasts and is stored through the synthesis of sugar from carbon dioxide CO 2 + H 2 O Sugars + O 2 Chloroplast Light Energy
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YOUR TURN Copy the following equation and write it in words 6CO 2 + 6H 2 O + energy → C 6 H 12 O 6 + 6O 2
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YOUR TURN 6CO 2 + 6H 2 O + energy → C 6 H 12 O 6 + 6O 2 ____________ uses the energy of ____________ to convert ____________ and ____________ into high energy ____________ and ____________.
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Light and Dark Reaction Light reaction: water molecule is split and oxygen is released Dark reaction (or Calvin cycle): H (from H 2 O) combine with CO 2 to from glucose
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Photosynthesis: 2 parts Light reaction: –happens inside the thylakoids –Traps light energy (with pigments) and converts it into chemical energy (ATP) –Pigments are light absorbing molecules; main one is chlorophyll Dark reaction –Happens in the stroma –Uses ATP from light reaction to produce high energy sugars
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Absorption of Light by Chlorophyll a and Chlorophyll b VBGYOR Chlorophyll b Chlorophyll a Chlorophyll and light Chlorophyll absorbs blue and red. That is why plants are green
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NOTES In photosynthesis, energy is captured from sunlight by chloroplasts and is stored through the synthesis of sugar from carbon dioxide 6CO 2 + 6H 2 O + energy → C 6 H 12 O 6 + 6O 2
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From Photosynthesis to Cellular Respiration After plants have made glucose (P/S), glucose is broken down in the mitochondria (cellular respiration) so the cell can use the energy
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YOUR TURN What type of cells use cellular respiration?
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Two Types of cellular respiration Aerobic (with oxygen) 36 ATP Anaerobic (without oxygen/”fermentation”) 2 ATP
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Aerobic Respiration can broken into 3 parts Glycolysis- occurs in cytoplasm, Krebs Cycle – occurs in mitochondria, Electron Transport occurs in mitochondria, produces 34 ATP’s
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