BI110 Lecture Notes - Lecture 23: Photosynthetic Pigment, Photosynthetic Reaction Centre, Photosystem Ii
Document Summary
It appears green because it is poor at absorbing green wavelengths. In a lab solution: absorption of visible light by an isolate chlorophyll molecule results in the release of heat and fluorescence when the electron returns to its ground state. In a plant: absorption of visible light by an antenna chlorophyll results in the transfer of energy to an electron in a neighbouring chlorophyll molecule. What happens when chlorophyll absorbs light: chlorophyll is the key molecule that absorbs light for photosynthesis. Two photosystems: the photosynthetic electron transport chain connects 2 photosystems, two systems are necessary to provide enough energy to pull electrons from water and then use them to reduce nadp+ Z scheme: absorption of light energy by ps ii allows electrons pulled from water to enter the photosynthetic etc, a second input of light energy by ps i produced electron donor molecules capable of reducing nadp+
