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Rubisco, the enzyme that fixes carbon dioxide, is often described as inefficient because it

  • A.also reacts with oxygen, wasting energy
  • B.requires light to be present to work
  • C.cannot function above ten degrees Celsius
  • D.is made in very small quantities only

Answer: A

Its competing reaction with oxygen leads to photorespiration, which consumes energy and releases fixed carbon. Plants compensate by making enormous quantities of the enzyme. It accounts for a large share of the soluble protein in a leaf.

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