Which of the following is FALSE regarding photosynthesis? A) The earliest form of photosynthetic reactions oxidized used) H₂O and yielded O₂. B) Development of oxygenic photosynthesis led to atmospheric changes that allowed evolution of cells/organisms able to use aerobic respiration. C) Some forms of photosynthesis involve oxidizing compounds such as ferrous iron or H₂S. D) It first appeared in ancient prokaryotes.

Question

Quizplus · Accepted Answer

The earliest form of photosynthetic reactions did not oxidize H₂S to yield oxygen (O₂). Instead, they used simpler compounds like H2S or Fe2+ as electron donors, and the byproducts of their photosynthesis included sulfur or iron compounds, not oxygen. Oxygenic photosynthesis, which evolved later, uses water as the electron donor, and produces oxygen as a byproduct.

Which of the Following Is FALSE Regarding Photosynthesis