Question: Choose the end products of non cyclic photophosphorylation:
Options:
2 ATP, 2 NADH, O2
8 ATP, 12 NADH, O2
6 ATP, 2 NADH, 2 O2
6 ATP, 3 NADH, 2 O2
-Moreover, NADPH should be produced, instead of NADH in photophosphorylation reaction.
-However, the correct explanation has been provided in the solution.
🔑Key Points:
-The initial stage of photosynthesis is the light reaction, which converts solar energy into chemical energy in the form of ATP and NADPH.
-NADPH and ATP are produced with the help of protein complexes and pigment molecules.
-Carbon dioxide is converted into carbohydrate molecules with the help of chemical energy acquired throughout the processes.
-The light energy splits into the water (photolysis) and removes the electrons from photosystem II.
-The electrons then go from PSII to b6f (cytochrome) to photosystem I (PSI) and diminish in energy form.
-The energy is subsequently transmitted to two-electron transport chains, which produce ATP and NADPH.
-In Photosystems I, electrons are re-energized, and high-energy electrons convert NADP+ to NADPH.
-Non-cyclic photophosphorylation –Â
-In non-cyclic photophosphorylation, the cytochrome uses Photosystem II's electron energy to pump hydrogen ions from the lumen to the stroma.
-Later, this energy allows the ATP synthase to attach to theADP molecule's third phosphate group, forming the ADP molecule.
-One ATP and 2 NADPH molecules are produced along with oxygen.
-Cyclic photophosphorylation –Â
-During cyclic photophosphorylation, the cytochrome b6f utilizes electron energy from both Photosystems I and II to build a number of ATP while stopping the creation of NADPH.
-This ensures that the correct amounts of ATP and NADPH are maintained.
-During the process, water is used and oxygen is liberated.
-Thus, light reactions use light energy to drive electron transport and proton pumping, converting the energy from light into the biologically useful form ATP and producing a viable source of reducing the power NADPH.