BIOL 005A Lecture Notes - Lecture 12: Photosystem Ii, Thylakoid, P680

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Details of the structure are for reference. You need to memorize only the general organization plan of this molecule: Fact of existence of minor differences between chlorophyll a and b. When a pigment absorbs light, it goes from a ground state to an excited state, which is unstable afterglow called fluorescence and heat. When excited electrons fall back to the ground state, photons are given off, and. If illuminated, an isolated solution of chlorophyll will fluoresce, giving off light. Many chlorophyll and carotenoid molecules act as a light harvesting antenna. Energy of a captured photon is transferred ( resonance transfer ) to. A photosystem represents reaction-center complex surrounded by light-harvesting neighboring molecules and finally to reaction center complexes. The light-harvesting complexes (pigment molecules bound to proteins) transfer the energy of photons to the reaction center. There are two types of photosystems in the thylakoid membrane.

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