Answer to Question #87417 in Cell Biology for Rachel

Question

In oxygenic photosynthesis, where does the oxygen molecule in glucose come from - is it from water or carbon dioxide? Not the oxygen released as a byproduct, but the oxygen present in the glucose molecule formed.

Answer 1

Oxygen in glucose comes from carbon dioxide.

In case of oxygenic photosynthesis, water splitting results in oxygen molecule that is released into the atmosphere.