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Manipal Medical Manipal Medical Solved Paper-2005

  • question_answer
    Radioactive\[{{C}^{14}}\]is given to\[C{{O}_{2}}\]and released to atmosphere. This\[C{{O}_{2}}\]is taken by\[RuBP\]in a\[{{C}_{3}}\] plant. First radioactive\[{{C}^{14}}\]is seen in which compound?

    A)  PGAL       

    B)  PEP

    C)  RMP        

    D)  PGA

    Correct Answer: D

    Solution :

     \[{{C}^{14}}\]is an isotope of carbon. It has been used to draw the path of carbon fixation in the process of photosynthesis. This levelled\[{{C}^{14}}\]becomes incorporated with\[^{14}C{{O}_{2}}\]which is accepted by\[RuBP\]and   a   3   carbon   compound, phosphoglyceric acid (3 PGA) is formed. 3-PGA is the first stable compound.


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