Download - Photosynthesis and Cellular RespirationSection 2 Energy in Living Systems Calvin Cycle CH 6 pg 120
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Photosynthesis and Cellular Respiration Section 2
Energy in Living SystemsCalvin Cycle
CH 6 pg 120
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Photosynthesis and Cellular Respiration Section 2
Factors that Affect Photosynthesis
• Light intensity (Electron Transport Chain)• Carbon dioxide concentration (Calvin Cycle)• Temperature (enzymes)
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Photosynthesis and Cellular Respiration Section 2
Producing Sugar (Calvin Cycle)• The first two stages of photosynthesis depend directly on
light to make ATP and NADPH.
• In the final stage of photosynthesis, ATP and NADPH are used to produce energy-storing sugar molecules from the carbon in carbon dioxide.
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Photosynthesis and Cellular Respiration Section 2
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Photosynthesis and Cellular Respiration Section 2
Calvin Cycle (continuous process)• CO2 diffuses into the stroma
• Carbon Fixation, an enzyme (RuBisCo) adds CO2 to a carbon molecule
• ATP and NADPH use their energy to drive these reactions to create molecules of G3P (3 carbon)– G3P are used to create sugar molecules to store energy for later use
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Photosynthesis and Cellular Respiration Section 2
G3P
PGAG3P
RuBP
G3P
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Photosynthesis and Cellular Respiration Section 2
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Photosynthesis and Cellular Respiration Section 2
Calvin Cycle (for more information)
• More description and explanation of Calvin Cycle are on the following slides.
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Photosynthesis and Cellular Respiration Section 2
Calvin Cycle• CO2 diffuses into the stroma
• The enzyme (RuBP) adds CO2 to a 5 carbon molecule
• This occurs several times to make a 6 carbon molecule – splits into 2 – 3 carbon molecules (PGA)
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Photosynthesis and Cellular Respiration Section 2
G3P
PGAG3P
RuBP
G3P
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Photosynthesis and Cellular Respiration Section 2
• Each of PGA is converted/made into G3P
• One G3P molecule leaves the Calvin Cycle to be used to make carbohydrates
• The remaining G3P molecules are recycled back to the enzyme RuBP and reenters the Calvin Cycle
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Photosynthesis and Cellular Respiration Section 2
G3P
PGA
G3P
RuBP
G3P
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Photosynthesis and Cellular Respiration Section 2• Each of PGA is converted/made into G3P
– G3P is a molecule with additional phosphate and H+ that were donated by ATP and NADPH
– ADP and NADP are then recycled to the ETC
• One G3P molecule leaves the Calvin Cycle to be used to make carbohydrates
• The remaining G3P molecules are recycled back to the enzyme RuBP and reenters the Calvin Cycle
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Photosynthesis and Cellular Respiration Section 2
Relationship