How do these two photosynthetic processes compare? The electron acceptor in both
ID: 100394 • Letter: H
Question
How do these two photosynthetic processes compare?
The electron acceptor in both plants and purple sulfur bacteria is H2O.
The electron donor in both plants and purple sulfur bacteria is CO2.
The electron acceptor in plants is H2O, and the electron acceptor in purple sulfur bacteria is H2S.
The electron donor in plants is H2O, and the electron donor in purple sulfur bacteria is H2S.
Organism Photosynthetic reaction Terrestrial plants 6 CO-+12 H2O C6H1:06 + 6 O2 + 6 H2O Purple sulfur bacteria 6 CO2 + 12 H2S CcH12Os + 12 S + 6 H2OExplanation / Answer
Answer: (d) The electron donor in plants is H2O, and the electron donor in purple sulfur bacteria is H2S.
Explanation:
In aerobic photosynthesis, such as in plants, light energy used to reduce CO2 to organic carbon using H2O as a source of electrons. O2 is evolved from splitting of H2O.
In anaerobic bacterial photosynthesis, such as in purple sulfur bacteria, light energy used to reduce CO2 to organic carbon (same as photosynthesis). H2S is used as the electron donor instead of H2O.
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