In photosystems of higher plants, there are about 250-400 pigments (number wise) in a particular photosystem. Out of which,approx 170-180 pigments are of chlorophyll a molecules. And any one of them behaves as a Reaction centre in a photosystem.
My question is:
- What are the factors and laws which decide which chlorophyll a molecule will work as a reaction centre?
- What's the difference in chlorophyll a molecules present in reaction centres of PS I and PS II since they have different threshold energy. Is there any structural difference?