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      Question

      Which of the following compounds serves as the

      biochemical precursor for the synthesis of the plant hormone ethylene?
      A GA₃ Correct Answer Incorrect Answer
      B IAA Correct Answer Incorrect Answer
      C Ethylene Correct Answer Incorrect Answer
      D Methionine Correct Answer Incorrect Answer

      Solution

      Methionine is converted via the Yang cycle to S-adenosyl methionine (SAM), which is the immediate precursor of ethylene, a gaseous hormone regulating ripening and senescence.

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