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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.
-These organisms were confounding because the prevailing hypothesis at that time was that
A)autotrophs released O₂ from the splitting of CO₂ to make sugars.
B)autotrophs didn't use CO₂.
C)CO₂ was released and oxygen used up during photosynthesis.
D)only heterotrophs released O₂ while fixing carbon.
E)the process of photosynthesis was unknown at this time.

Question

Quizplus · Accepted Answer

The prevailing hypothesis at the time was that autotrophs released O₂ from the splitting of CO₂ to make sugars. Van Niel's research on bacteria photosynthesis challenged this hypothesis.

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