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Photosynthesis

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Multiple Choice

The first event in the Calvin cycle is the attachment of carbon dioxide to the five carbon RuBP molecule, which ____________.

  1. forms a six carbon molecule that immediately breaks down into two three carbon PGA molecules
  2. is a reaction assisted by large quantities of RuBP carboxylase enzyme
  3. decreases cell carbon dioxide levels that increases the diffusion gradient
  4. 1, 2 and 3 are correct
  5. immediately becomes a six carbon sugar that is the base for starch, sucrose, cellulose, etc.
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