BIOSC-101 Lecture Notes - Lecture 6: Photosystem Ii, Photosystem I, Ferredoxin
20 Jun 2020
School
Department
Course
Professor
Document Summary
Photosystem ii triggers chemiosmosis and atp synthesis in the chloroplast. When an excited electron leaves the chlorophyll in the reaction center of. Photosystem ii, the electron is accepted by pheophytin, transferred to plastiquinone (pq), and then stepped down in energy along an etc. Electron transport between photosystem ii and the cytochrome complex. Pq carries electrons photosystem ii along with protons from the stroma. The cytochrome complex oxidizes pq, releasing the protons in the thylakoid lumen that drive atp synthesis. When excited electrons leave photosystem ii and enter the etc, the photosystem becomes so electronegative that enzymes can remove electrons from h2o, leaving. This is the only known protein complex that can split h2o. The h+ transported by pq result in a large [h+] in the lumen. Atp is made by photophosphorylation; the process is initiated by energy harvested from light.
