Not every carbon atom of the plant photosynthesizing in the presence of radio-labelled carbon dioxide will be labelled. This happens because only one molecule of carbon dioxide is incorporated with the ribulose-1,5-bisphosphate (RuBP) in C3 cycle to form the glucose.
Radio-labelling is the technique of applying the tag upon a molecule to track its pathway or functioning. The technique is extensively used in living organisms, drug industry or chemicals industry.
RuBP is a molecule that forms the sugars from carbon dioxide during photosynthesis. This formation is catalyzed by the enzyme called RubisCO. RuBP is commonly known as a carbon acceptor.
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