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Before looking at the process of photosynthesis, you need to be aware of the structure of the chloroplast. Same as mitochondria, chloroplasts used to be a type of bacteria (cyanobacteria) that got engulfed by early cells and they share a symbiotic relationship, and the bacteria eventually got passed on as part of the cell, leading to the chloroplasts now found in plant cells. Pay special attention to the thylakoid membrane and stroma, as they are the sites of the two stages of photosynthesis.
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