BIOL 212 Lecture Notes - Lecture 21: Photosystem I, Atp Synthase, Electrochemical Gradient
Document Summary
Chloroplast: takes in light, water, co2, to produce o2 to create sugar, sugar is taken in by mitochondria along with o2 to produce co2 and atp. Chloroplasts in plant cells composed of specialized membranes and compartments. Have extra internal compartment, thylakoid membrane and thylakoid space. Also contains chloroplast dna, ribosomes, trnas, and various enzymes required for chloroplast gene expression. Most chloroplast proteins encoded by nucleus and imported from cytosol after translation. 3rd membrane structure inside chloroplast, sealed and disconnected from inner membrane. Contains energy-generating systems of chloroplast (light capturing systems, electron transport chain, atp synthase) Energy capturing (stage 1, light reactions) and sugar manufacturing (stage 2, dark reactions) Green pigment absorbs energy of light photons. Part of large multi protein complexes called photosystems. Antenna complex (captures energy from light in form of high energy electrons: light energy converted into chemical energy. Reaction center (transfers high energy electrons to electron transport chain) Photosystem ii plastoquinone cytochrome b6-f complex photosystem i ferredoxin-
