DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Transmission electron micrograph of a chloroplast from a leaf of the tobacco plant, Nicotiana tabacum. Chloroplats are the sites of photosynthesis in green plants. The threadlike structures running the length of the chloroplast are grana, stacks of flattened membranes that contain the photosynthetic pigments, or chlorophylls. These pigments absorb and convert the Sun's energy into the chemical energy required by the plant. The faint white patches within the chloroplast are called nucleoids, where chloroplast DNA is stored. Magnification: x6300 at 35mm size, x44,000 at 8x10-inch size.
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