It catalyzes a phosphorylation reaction. It has an affinity for both O2 and CO2. 33 A biologist ground up some plant cells and then centrifuged the mixture. She obtained some organelles from the sediment in the test tube. The organelles took up CO2 and gave off O2.
Photosynthesis occurs only in plants and respiration occurs only in animals.
ATP molecules are produced in photosynthesis and used up in respiration.