Question

In a series of reaction during carbon fixation, 'A', a six carbon compound reacts with a three carbon compound to gives rise 'B', a four-carbon compound and 'C', five carbon compound. 'B' reacts with a three carbon compound to form D, a seven carbon compound. 'D' reacts with triose to form two molecules of 'E', five-carbon compounds. Identify the reactant with 'B' and enzyme involved in the formation of 'D' respectively.

• A. Gly3-P, aldolase
• B. DHAP, aldolase
• C. Erythrose, transketolase
• D. Erythrose, aldolase

Answer 1

The correct option is D Erythrose, aldolase

• A refers to Fructose-6-phosphate which reacts with Glyceraldehyde-6-phosphate to give Erythrose-4-phosphate (B) and Xylulose-5-phosphate (C).
• Erythrose-4-phosphate (B) reacts with Dihydroxyacetone phosphate to give sedoheptulose-1,7-bisphosphate (D).
• The enzyme for this reaction is aldolase.
  

So, the correct answer is 'Erythrose, aldolase'