A special green pigment in photosynthetic bacteria that allows them to capture light energy and produce their own food.
From bacteria + chlorophyll (from Greek 'chloros' meaning green + 'phyllon' meaning leaf). Discovered in the early 1900s as scientists studied purple and green bacteria.
Bacteriochlorophyll is slightly different from plant chlorophyll and absorbs different wavelengths of light, which is why some photosynthetic bacteria appear purple or brown instead of green!
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