BIO203H5 Lecture Notes - Lecture 6: Cytochrome B6F Complex, Photosystem Ii, Plastoquinone
Document Summary
Features of woody stems: monocot wood: monocots do not undergo secondary growth at all, the woody characteristics seen in some monocots (like palm trees) are achieved by extensive thickening of primary tissue. These electrons are passed onto plastoquinone (plastoquinone pqa and pqb) first pqa then. Pqb, the electrons in pqb passed onto the cytochrome b6/f complex. They are finally donated to a molecule named plastocyanin which is a mobile electron acceptor, it connects photosystem 2 and photosystem 1 , it moves electrons between these two systems. Electrons need to be replenished because if they are not replenished they can"t be lost again photosynthesis would stop, the electrons at p680 would be lost and not replenished so not electrons to donate therefore photosynthesis would stop. The electrons lost at the p680 complex, the ones that are replenished come from water, that"s why water is used in photosynthesis. If you give isolated chloroplast light energy and water they will release oxygen.
