AP BIOLOGY

Detailed explanation-1: -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. The excited electron must then be replaced.

Detailed explanation-2: -Antenna complex: The complex contains many pigments that absorb the light at different wavelengths and transfer the absorbed light energy to the core complex which further transfers to the reaction center. The reaction center in photosystem I, where chlorophyll pigment absorbs light of a wavelength of 700nm.

Detailed explanation-3: -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.

Detailed explanation-4: -Light-harvesting complexes (LHC) are important for photosynthetic efficiency, photoprotection, and photoacclimation. These protein structures surround photosystem reaction centers, which are embedded in the thylakoid membranes within plastids.

Detailed explanation-5: -Each photosystem is serviced by the light-harvesting complex, which passes energy from sunlight to the reaction center; it consists of multiple antenna proteins that contain a mixture of 300–400 chlorophyll a and b molecules as well as other pigments like carotenoids.