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You have learned about research conducted during the 1930s by van Niel, who studied photosynthesis in bacteria, which were observed to not release O₂ even though they fixed CO₂.
-From his experiments, van Niel concluded that
A)he must have done something wrong.
B)something else was being used to provide hydrogen.
C)CO₂ was not being split to produce O₂.
D)CO₂ was directly involved in O₂ production.
E)H₂O was being used to provide hydrogen.

Question

Quizplus · Accepted Answer

van Niel's research showed that bacteria fix CO₂ but do not release O₂, suggesting that CO₂ was not being split to produce O₂ in these organisms. This led to his conclusion that something else must be used to provide the electrons for the reduction of CO₂, which turned out to be H₂S in the case of the bacteria he studied. Therefore, choice C is the correct option.

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