Which of the following groups does not use water as a proton donor?
Correct answer: B. Purple sulphur bacteria
- A. Cyanobacteria
- B. Purple sulphur bacteria
- C. Plants
- D. Algae
Explanation
Purple sulfur bacteria use hydrogen sulfide (H₂S) as their proton and electron donor, distinguishing them from other groups like cyanobacteria, plants, and algae, which all use water (H₂O) in their photosynthetic processes. This unique characteristic of purple sulfur bacteria allows them to thrive in environments where hydrogen sulfide is more abundant than water.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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