Multiple choice The set of enzymes important for the regeneration of RUBP are aldolase and fumerase phosphatase and transketolase aldolase and transketolase isomerase and sucrase Reveal answer Fill a bubble to check yourself C Correct answer Explanation Aldolase and transketolase are key enzymes regenerating RuBP. Aldolase forms carbon-carbon bonds; transketolase rearranges sugar phosphates to restore RuBP for continued CO2 fixation.