Question

    In the C4 pathway, which of the following molecules

    combines with carbon dioxide?
    A glyceraldehyde phosphate Correct Answer Incorrect Answer
    B ribulose biphosphate Correct Answer Incorrect Answer
    C phosphoenol pyruvic acid Correct Answer Incorrect Answer
    D citric acid Correct Answer Incorrect Answer

    Solution

    The C4 pathway initiates with a molecule called phosphoenolpyruvate (PEP) which is a 3-carbon molecule. This is the primary CO2 acceptor and the carboxylation takes place with the help of an enzyme called PEP carboxylase.

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