Final answer:
The reaction center of photosystem II includes multiple transmembrane protein subunits and two special P680 chlorophyll molecules that play a crucial role in the light-dependent reactions of photosynthesis.
Step-by-step explanation:
The reaction center of photosystem II consists of multiple transmembrane protein subunits and exactly two P680 chlorophyll molecules.
These chlorophyll molecules are specially adapted to undergo oxidation and are essential in the process of absorbing light and transferring it as energy for photosynthesis.
The P680 chlorophyll molecules play a critical role in the light-dependent reactions by ejecting electrons when exposed to light, a process referred to as a photoact.
The entire photosystem with its reaction center is embedded in the thylakoid membrane of chloroplasts.