Multiple choice

Why is enzyme triosephosphate isomerase required in the regeneration step of Calvin cycle?

  1. Conversion of a G3P and a DHAP into fructose 6-phosphate (6C)

  2. Conversion of all of the G3P reversibly into dihydroxyacetone phosphate

  3. Synthesis of erythrose-4-phosphate

  4. Cleavage of sedoheptulose-1,7-bisphosphate into sedoheptulose-7-phosphate
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B Correct answer
Explanation

Triosephosphate isomerase is required for conversion of all of the G3P reversibly into dihydroxyacetone phosphate (DHAP), which is a 3-carbon molecule.

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