DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY
Chloroplasts. Coloured transmission electron micrograph (TEM) of two chloroplasts seen in the leaf of a pea plant Pisum sativum. Each chloroplast is seen cut lengthways and contains stacks of flattened membranes (yellow) known as grana. The chloroplasts are surrounded by an external double membrane. The grana contain the chlorophyll pigments, where light reactions occur during photosynthesis. Light and carbon dioxide are converted into carbohydrates by the chloroplast. Large sites of starch produced during photosynthesis are seen as dark circles within each chloroplast. Magnification: x16,000 at 5x7cm size.
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