The Calvin cycle is the set of chemical reactions that take place in the chloroplasts during photosynthesis. This cycle begins when a 5-carbon compound called ribulose 1-5-bisphosphate "catches" one CO2 molecule and makes a 6-compound molecule.
That's the start...immediately after that the enzyme Rubisco breaks up the 6-compound molecule into 2 equal parts (2 molecules of 3-phosphoglycerate)
Temporary copies of the information found in DNA; rRNA, or ribosomal RNA, that serve as structural components of protein-making structures known as ribosomes; and finally, tRNA, or transfer RNA, that ferry amino acids to the ribosome to be assembled
