BIOL 1000 Lecture Notes - Lecture 4: Porphyrin, Photosynthesis, Chlorophyll
16 May 2016
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Document Summary
Photosynthetic organisms are the primary producers of the earth. Photosynthesis has two stages: light dependant reactions, light independent reactions (calvin"s cycle) Chlorophylls and carotenoids are how plants ended up with their photosynthesis structures. Porphyrin ring: light absorbing head of a molecule. Wavelengths are precise, can alter the structure if changed. Ground state: closest to nucleus, low energy level. Excited state: furthest to nucleus, high energy level. Each photosystem is composed of a large antenna complex of pigments that surrounds a central reaction centre. Photon absorbed by pigments in the antenna complex. Energy is transferred to pair of chlorophyll a and then to the primary electron acceptor in the reaction centre. Etc aids in creation of h+ concentration gradient. Keeps moving protons across thylakoid membrane without involvement of photosystem. Energy absorbed from light converted into chemical energy of atp without reduction of.
