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Q.

In an experiment, the carbon dioxide available to a C3 plant was labelled with a radioactive isotope and the amount of radioactivity in the chloroplast was measured. As photosynthesis proceeded, in which of the following molecules did the radioactivity first appear?

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a

PGAL

b

PEP

c

PGA

d

RuBP

answer is C.

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Detailed Solution

Use of radioactive 14C in photosynthesis studies led to the discovery that the first CO2 fixation product was a 3-carbon organic acid. The first product identified was 3-phosphoglyceric acid or in short PGA.

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In an experiment, the carbon dioxide available to a C3 plant was labelled with a radioactive isotope and the amount of radioactivity in the chloroplast was measured. As photosynthesis proceeded, in which of the following molecules did the radioactivity first appear?