2/11/2024 The term that crawling cells that move through a sponge delivering food and oxygenRead Now![]() ![]() Phototrophic eukaryotes such as green plants perform photosynthesis in plastids that are thought to have their ancestry in cyanobacteria, acquired long ago via a process called endosymbiosis. These are flattened sacs called thylakoids where photosynthesis is performed. Unlike heterotrophic prokaryotes, cyanobacteria have internal membranes. Cyanobacteria use photosynthetic pigments, such as carotenoids, phycobilins, and various forms of chlorophyll, which absorb energy from light. Sericytochromatia, the proposed name of the paraphyletic and most basal group, is the ancestor of both the non-photosynthetic group Melainabacteria and the photosynthetic cyanobacteria, also called Oxyphotobacteria. They appear to have originated in freshwater or a terrestrial environment. The name cyanobacteria refers to their color (from grc κυανός (Script error: No such module "Ancient Greek".) 'blue'), giving them their other name, "blue-green algae", though modern botanists restrict the term algae to eukaryotes and do not apply it to cyanobacteria, which are prokaryotes. Cyanobacteria (/saɪˌænoʊbækˈtɪəri.ə/), also known as Cyanophyta, are a phylum of Gram-negative bacteria that obtain energy via photosynthesis.
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