Tham khảo tài liệu 'sat ii biology episode 1 part 5', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | ENERGY FOR LIFE ANABOLISM AND CATABOLISM Phosphorylation Phosphorylation is the process by which ADP returns to the high-energy molecule ATP. In an endergonic reaction energy and a free phosphate are added to ADP to reform ATP. Sources It is the formation of these bonds that occurs in the catabolism of energy-rich carbon molecules during respiration. The ATP that is formed in respiration is primarily a carrier molecule for energy. PHOTOSYNTHESIS Photosynthesis is the production of high-energy molecules in the presence of light using carbon dioxide water chlorophylls ATP NADP and enzymes. A change in any of these ingredients will of course change the rate of the reaction. The overall reaction is given by 6CO 12H 0---------- CRI-L OR 60 6H 0 2 2 enzymes 6 12 6 2 2 chlorophyll Summary of Photosynthesis Chlorophyll Chlorophyll is actually several light-absorbing pigments including chlorophylls a and b found in chloroplasts that are involved in absorbing light energy which is then passed on to the reaction centers of the photosystems through the use of antenna chlorophylls. Peterson s SAT II Success Biology E M CHAPTER 3 Light Reactions Light reactions are comprised of reactions that occur in the presence of light in what are called photosystem I and photosystem II. These reactions carry on the phosphorylation that produces ATP. The LR take place in the thylakoids located in the grana of the chloroplasts. Photosystems I PS I This reaction center contains a chlorophyll molecule known as P700 which absorbs light energy in the 700-nanometer range and reactivates energy-drained electrons from PS II. These activated electrons reduce NADP1 to NADPH a carrier molecule that transports both energy and hydrogen to the carbon fixation reactions in what are sometimes known as the dark reactions. It takes part in both cyclic and noncyclic photophosphorylation. Photosystems II PS II In this reaction center the chlorophyll molecule known as P680 which has an .
