Question

photoautotrophy define​

Answer 1

Answer:

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Explanation:

Photoautotrophy refers to the utilization of solar electromagnetic radiation for energy conservation. In most cases, but not all phototrophy also implies a close coupling to the energy requirement for reduction of CO2 for assimilation into organic matter according to the general scheme:

where H2A represents an external electron donor and A is an oxidized product in a process referred to as photosynthesis.

The most important examples of photoautotrophy are based on chlorophylls or bacteriochlorophylls. In both cases a reaction center consists of a chlorophyll or bacteriochlorophyll molecule surrounded by other light-harvesting molecules, including carotenoids, and that absorb light in the 400 nm–550 nm range and sometimes other accessory photosynthetic pigments, phaeophytin and an electron transport chain. The wavelengths exploited are within the range of 400 nm–1000 nm, but different regions of this band are exploited by different chlorophylls and accessory photosynthetic pigments, so there is a differential utilization of the light spectrum among different types of phototrophs based on the pigments they possess. The reaction centers reside in the membranes of intracellular vesicles or tubular structures, which either constitute invaginations of the cell membrane (in purple bacteria and cyanobacteria) or are made up of special (non-unit) membranes (in green non-sulfur phototrophic bacteria, e.g.,