Two types of autotrophic nutrition are distinguished: phototrophic and chemotrophic.
Phototrophs are organisms for which sunlight is a source of energy. This type of nutrition is called photosynthesis. Green plants and multicellular algae, as well as cyanobacteria and many other groups of bacteria, are capable of photosynthesis due to the pigment chlorophyll contained in their cells. Archaea from the group of halobacteria are capable of chlorophyll-free photosynthesis, in which the bacteriorhodopsin protein captures and converts the energy of light.
Chemotrophs – they use the energy of chemical bonds of food or reduced inorganic compounds, such as hydrogen sulfide, methane, sulfur, ferrous iron, etc. as an external energy source.
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