In procaryotic algae (Cyanophyta) the photosynthetic, genetic and respiratory apparatuses are present in the cell but are not separated from each other by a bounding membrane of their own. Consequently, the cells lack organized nuclei, chromatophores and mitochondria (Fig. 2-1 A). In eucaryotic algae, on the other hand, the photosynthetic, genetic and respiratory apparatuses are membrane-bounded and separated from each other (Fig. 2-1 B).
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