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Unformatted text preview: oxygen released into the early atmosphere, transforming our planet from one with an oxygen-free atmosphere, to the modern one that has a significant amount of oxygen present. . In addition to chlorophyll a , cyanobacteria also have the blue pigment phycocyanin and the red pigment phycoerythrin . Eukaryotic autotrophs all have chloroplasts in which the photosynthetic process occurs. The typical chloroplast organization has thylakoids surrounded by a fluid-like stroma. The chloroplast is a membrane bound organelle. Prokaryotes by definition lack such structures. How can bacteria carry out photosynthesis? The answer is shown in Figure 14. By infolding their cell membrane, prokaryotic autotrophs form thylakoids, in effect turning the bacterium into a single chloroplast....
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