A photosystem is a protein complex in chloroplasts and cyanobacteria that absorbs light during photosynthesis, initiating the conversion of light energy into chemical energy. It consists of a reaction center surrounded by light-harvesting complexes.
5 Must Know Facts For Your Next Test
Photosystems are integral components of the thylakoid membranes in chloroplasts.
There are two main types: Photosystem I (PSI) and Photosystem II (PSII), each playing distinct roles in the light reactions of photosynthesis.
Photosystem II captures photons to split water molecules, releasing oxygen and generating electrons.
Photosystem I uses light energy to produce NADPH from NADP+ and H+.
The efficiency of photosystems is critical for the overall productivity of photosynthesis.
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Related terms
Thylakoid Membrane: The internal membrane system in chloroplasts where photosynthesis occurs.