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  4. Radioactive CO2(14CO2) is added to the suspension of a photosynthesising green algae. Which compound of the following will be labelled first with 14CO2 ?

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Q. Radioactive $ C{{O}_{2}}{{(}^{14}}C{{O}_{2}}) $ is added to the suspension of a photosynthesising green algae. Which compound of the following will be labelled first with $ ^{14}C{{O}_{2}} $ ?

Bihar CECEBihar CECE 2015

Solution:

3-carbon, Phosphoglyceric Acid (PGA) is the first stable compound formed in Calvin cycle after the fixation of $ C{{O}_{2}} $ . It is a metabolic intermediate in both glycosis and the Calvin cycle.