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Question

Anoxygenic phototrophic bacteria do not utilize:

A
Water
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B
CO2
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C
H2S
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D
Thiosulphate
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Solution

The correct option is A Water
There are several bacteria that cannot oxidize water. Thus, they perform anoxygenic photosynthesis that depends on mostly Hydrogen Sulphide. Anoxygenic photosynthesis reaction is represented as:
CO2+H2Senergy−−−lightsugars+sulphur+water

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