Question

# Radioactive isotopes can be used for identifying reaction pathways. Which one of the following would contain oxygen radioisotopes, if oxygen atoms in water are used as radioisotopes?

A
In glucose molecules
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B
In water
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C
In oxygen gas
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D
In ATP
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E
In carbon dioxide
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Solution

## The correct option is C In oxygen gasDuring photosynthesis, water molecules serve as electron donor and splitting of water molecules in the presence of sunlight leads to the release of oxygen gas. Therefore, if oxygen atoms in water as used as radioisotopes; the oxygen gas will exhibit radioactivity. Carbon dioxide is fixed into glucose molecules using the energy of ATP formed during photophosphorylation and water molecules do not serve as the source of oxygen in glucose or carbon dioxide. Therefore, the correct answer is option C.

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