Could someone please help me with the “light dependant reaction/stage, in photosynthesis?
When chlorophyll a absorbs light energy, an electron gains energy and is ‘excited’. The excited electron is transferred to another molecule (called a primary electron acceptor). The chlorophyll molecule is oxidized (loss of electron) and has a positive charge. Photoactivation of chlorophyll a results in the splitting of water molecules and the transfer of energy to ATP and reduced nicotinamide adenine dinucleotide phosphate (NADP). The chemical reactions involved include: condensation reactions – responsible for water molecules splitting out, including phosphorylation (the addition of a phosphate group to an organic compound) oxidation/reduction (redox) reactions involving electron transfer Photosynthesis is a two stage process. 1. The Light dependent reactions, a light-dependent series of reactions which occur in the grana, and require the direct energy of light to make energy-carrier molecules that are used in the second process: light energy is trapped by chlorophyll to make ATP (ph