Multiple choice RuDP is Ribose di-phosphate Ribulose di-phospharous Ribose di-phosphorous Ribulose di-phosphate Reveal answer Fill a bubble to check yourself D Correct answer Explanation RuDP (Ribulose diphosphate) is a 5-carbon sugar molecule that plays a crucial role in the Calvin cycle of photosynthesis, where it accepts carbon dioxide to begin carbon fixation.