Unit V – Cell Energy The Story of Mitochondria & Chloroplasts.
Chapter 7. The Cell: Chloroplasts
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Transcript of Chapter 7. The Cell: Chloroplasts
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• Chapter 7.
The Cell: Chloroplasts
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Overview
Chloroplasts are organelles that convert energy to forms that cells can use for work
chloroplasts:from sunlight to ATP & carbohydrates
ATP = active energy carbohydrates = stored energy
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Chloroplasts
Chloroplasts are plant organelles chloroplasts
store chlorophyll & function in photosynthesis
in leaves, other green structures of plants & in eukaryotic algae
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Chloroplasts
Function photosynthesis
generate ATP & synthesize sugars transform solar energy into chemical energy produce sugars and oxygen from CO2 & H2O
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Structure of a Chloroplast Structure
2 membranesouter membrane inner membrane
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Structures of a Chloroplast
• Thylakoid- system of membrane that is arranged in flattened sacs
• Light reactions take place in the Thylakoids.
• Chemiosmosistakes place across the membrane of a Thylakoid.
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Structures of a Chloroplast
• Granum (grana is plural) – stack of connected and layered thylakoids
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Structures of a chloroplast
• Stroma- solution that surrounds the grana
The Calvin Cycle (light- independent reactions) takes place in the stroma.
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Why are chloroplasts green??• Chloroplasts contain a green pigment called
chlorophyll. This is what makes plants green
• Chlorophyll has a green pigment • Pigment = a substance which produces a
characteristic color as a result of the color (of light) being reflected because of its wavelength