In 2005, a new species of green sulfur bacteria was discovered near a geothermal vent at the bottom of the ocean. An exceptionally efficient light-harvesting mechanism allows these bacteria to carry out photosynthesis where the only illumination is a dim volcanic glow emanating from the vent. Cell membranes are required for electron transfer chains in the light-dependent reactions, but these bacteria have no internal membranes. How do you think they carry out the light-dependent reactions?
To explain: The light-dependent reactions of green sulfur bacteria.
Concept introduction: Green sulfur bacteria belong to the group of obligate anaerobes and a recently discovered bacterial species (2005). Green sulfur bacteria have a unique photosynthesis called as anoxygenic photosynthesis. In anoxygenic photosynthesis, reaction center chlorophyll is absent, instead bacteriochlorophylls are present.
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