BIOL 112 Lecture Notes - Lecture 7: Atp Synthase, Photosystem Ii, Photophosphorylation

• School: McGill University
• Department: Biology
• Course: BIOL 112
• Professor: Varied

Document Summary

* psii & psi = light harvesting complexes/embedded in thylakoid membrane. Few hundred in each thylakoid w/ b- reaction center containing chlorophyll a. Surrounded by a- antenna pigments that funnel energy to b- reaction center. Capture wavelengths that chlorophyll a does not & pass. Energy to chlorophyll a where direct light reaction occurs. Chlorophyll molecules transmit energy from excited e- in antenna complex to reaction center. Primary e- acceptors = remove excited e- from antenna complex"s chlorophylls. Production of nadph & atp = phosphorylation (atp production) Adp + pi + light atp *light-dependent reaction. Photosystem ii & i psii & psi = absorb light: e-trapped by p680 in psii = energized by light photons, 2 e- excited passed to primary e- acceptor (1st in etc) H2o o2 + 2h+ + 2 e- Water split - photolysis: 2 e- from water replace 2 e, 2 e- excited from primary e- acceptor.