Multiple choice PGA Kinase catalyses the reaction PGA + ATP à 1, 3 - bispohosphoglycericacid 1, 3 - bispohosphoglyceriacid à G - 3 - p RUBP + CO2 à 2 moles of PGA Er - 4 - p + DHAP à S - 1, 7 BP Reveal answer Fill a bubble to check yourself A Correct answer Explanation PGA kinase phosphorylates 3-PGA to 1,3-bisphosphoglycerate using ATP in Calvin cycle. Option B is the next step (G3P formation), C is Rubisco carboxylation, D is regeneration phase.