Photoautotrophic bacteria:

They utilize sunlight as their source of energy to produce food. However unlike photosynthetic eukaryotic cells they do not divide water to acquire reducing power. Therefore Oxygen is not developed during bacterial photosynthesis. Based on the nature of hydrogen donor such bacteria might be:

1. Photolithotrops:

In Photolithotrops the hydrogen donor is an inorganic substance. In green sulphur bacteria (Example: Chlorobium) hydrogen sulphide (H₂s) is the hydrogen donor. And chlorophyll is bacterioviridin.

In purple sulphur bacteria (example: Chromatium) thiosulphate performs as hydrogen donor. The chlorophyll is a bacteriochlorophyll.

2. Photo-organolithotrophs:

In Photo-organolithotrophs the hydrogen donor is an alcohol or organic acid, example: Purple non sulphur bacteria (example:  Rhodospirillum)

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