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Unformatted text preview: chloroplasts. The photograph below is an Elodea leaf (X 400). The numerous green structures are chloroplasts. Click on the photograph to view an enlargement. A double membrane surrounds the chloroplast. Chloroplasts contain membranous disk-like structures called thylakoids that are stacked together in larger structures (grana) that resemble stacks of coins (see diagram below). Molecules that absorb light energy (called photosynthetic pigments) are located in the thylakoid membranes. The fluid-filled space surrounding the grana is the stroma . Many enzymes needed in photosynthesis are found embedded in the thylakoid membranes and in the stroma. Click here to view the chapter on photosynthesis The diagram below shows a chloroplast that has been cut lengthwise to reveal the interior....
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