MGIMS WARDHA MGIMS WARDHA Solved Paper-2010

  • question_answer
    In sngarcane plant, \[^{14}C{{O}_{2}}\]is fixed in a malic acid, in which the enzyme that Fixes \[C{{O}_{2}}\]is

    A)  ribulose phosphate kinase

    B)  fructose phosphatase

    C)   ribulose hiphosphate carboxylase

    D)  phosphoenol pyruvic acid carboxylase

    Correct Answer: D

    Solution :

                     In \[{{\text{C}}_{\text{4}}}\text{-}\]plants, \[C{{O}_{2}}\]is picked up by phosphoenol pyruvate (PEP) and the reaction being catalysed by PEP carboxylase. \[\text{C}{{\text{O}}_{\text{2}}}+\,PEP\xrightarrow[\begin{smallmatrix}  \text{Mesophyll}\,\text{cells} \\  \text{of}\,\text{a}\,{{\text{C}}_{\text{4}}}\text{-}\,\text{plant} \end{smallmatrix}]{\text{PEP}\,\text{carboxylase}}\,\text{Oxalo}\,\text{acetic}\,\text{acid}\]                                                 dehydro               NADPH                                                 genesa                                                              Malic acid       +  \[NAD{{P}^{+}}\]


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