Multiple choice The end product of the Calvin cycle is ________. ATP ribulose bisphosphate (RuBP) phosphoglyceraldehyde (PGAL) PEP carboxylase (PEPcase) Carbon dioxide Reveal answer Fill a bubble to check yourself C Correct answer Explanation The Calvin cycle uses ATP and NADPH to fix carbon dioxide into G3P (phosphoglyceraldehyde), which is often referred to as PGAL.