AP BIOLOGY

Detailed explanation-1: -A photosystem consists of a light-harvesting complex and a reaction center. Pigments in the light-harvesting complex pass light energy to two special chlorophyll a molecules in the reaction center. The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor.

Detailed explanation-2: -A photosystem consists of a reaction-center complex surrounded by several light-harvesting complexes, The reaction-center complex is an association of proteins holding a special pair of chlorophyll molecules and a primary electron acceptor.

Detailed explanation-3: -The light-harvesting complex (or antenna complex) is an arrangement of various proteins and hundreds of chlorophyll molecules embedded in the thylakoid membrane of plants, which transfer light energy to one chlorophyll ‘a’ molecule at the reaction centre of a photosystem.

Detailed explanation-4: -The heart of photosystem II is the reaction center, where the energy of light is converted into the motion of energized electrons. At the center is a key chlorophyll molecule. When it absorbs light, one of its electrons is promoted to a higher energy.

Detailed explanation-5: -The light-harvesting complex (or antenna complex; LH or LHC) is an array of protein and chlorophyll molecules embedded in the thylakoid membrane of plants and cyanobacteria, which transfer light energy to one chlorophyll a molecule at the reaction center of a photosystem.