H2S oxidation was one of the earliest mechanisms of photosynthesis on the ancient Earth. This mechanism requires less energy input than H2O oxidation. Suggest a reason why this major shift in electron source occurred.

H2S oxidation was one of the earliest mechanisms of photosynthesis on the ancient Earth. This mechanism requires less energy input than H2O oxidation. Suggest a reason why this major shift in electron source occurred.

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter21: Photosynthesis

Section: Chapter Questions

Problem 18P: The Overall Free Energy Change for Photosynthetic NADP+ Reduction What is the overall free energy...

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Concept explainers

Photosynthesis

Plants have a capacity that we humans can only imagine— the ability to produce food from sunlight. Sure, we can prepare some dishes that we can savor on, but it become possible because of the plants (as they serve as a producers of all the raw materials required). Photosynthesis is the method of assembling carbohydrates with the aid of sunlight.

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H2S oxidation was one of the earliest mechanisms of photosynthesis on the ancient Earth. This
mechanism requires less energy input than H2O oxidation. Suggest a reason why this major shift
in electron source occurred.

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