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Chapter 7. The Cell: Chloroplasts

Chapter 7. The Cell: Chloroplasts . 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. Chloroplasts. Chloroplasts are plant organelles

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Chapter 7. The Cell: Chloroplasts

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  1. Chapter 7.The Cell: Chloroplasts

  2. 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

  3. Chloroplasts • Chloroplasts are plant organelles • chloroplasts • store chlorophyll & function in photosynthesis • in leaves, other green structures of plants & in eukaryotic algae

  4. Chloroplasts • Function • photosynthesis • generate ATP & synthesize sugars • transform solar energy into chemical energy • produce sugars and oxygen from CO2 & H2O

  5. Structure of a Chloroplast • Structure • 2 membranes • outer membrane • inner membrane

  6. Structures of a Chloroplast • Thylakoid- system of membrane that is arranged in flattened sacs • Light reactions take place in the Thylakoids. • Chemiosmosis takes place across the membrane of a Thylakoid.

  7. Structures of a Chloroplast • Granum (grana is plural) – stack of connected and layered thylakoids

  8. Structures of a chloroplast • Stroma- solution that surrounds the grana The Calvin Cycle (light- independent reactions) takes place in the stroma.

  9. 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

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