Which Of The Following Compounds Is Required For The Carboxylation Step Of The Calvin Cycle?

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Which Of The Following Compounds Is Required For The Carboxylation Step Of The Calvin Cycle?

a. ATP and NADPH b. ATP c. NADPH d. RuBP e. 3-PGA
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d. RuBP The carboxylation step of the Calvin cycle is where carbon dioxide is added to the five carbon molecule. Refer to page 157,158 in your book. The 5-carbon sugar is called ribulose 1,5-biphosphate (RuBP) and is catalyzed by the enzyme ribulose biphosphate carboxylase oxygenase (rubisco). RuBP and Co2 diffuse into the active site of rubisco and once the active site is occupied the addition of CO2 to RuBP proceeds spontaneously in the sense that NO ADDITION OF ENERGY IS REQUIRED. The product of caraboxylation is a 6-carbon compound that immediately breaks into two molecules of 3-phosphoglycerate (3-PGA).
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