BIO 150 1nd Edition Lecture 34 Outline of Last Lecture I. Photosynthesis II. Harvesting Energy Outline of Current Lecture II. Photosynthesis Current Lecture- Photosynthesis occurs in the chloroplast - Light capturing reactions take place in the thylakoid membrane- Chlorophyll will absorb all wavelengths except for green, green will be reflected ofo Accessory pigments expand the wavelength range that can be used- Absorption of a photon will excite an electron in the chlorophyllo Diferent wavelength lights excite diferent amounts of photon energy sources Red light – excites to a high level energy state Blue light – excites to a higher level energy state Green light – in between the two, will not emit energy- Antenna complex will emit energy to the reaction centero The energy will be funneled to the reaction center chlorophyll activating it – making it a great reducing agent- Chlorophyll passes an electron to an electron acceptor (Pheophytin)- Chlorophyll can be reducedo H2O will be split by oxygen evolving complex – this occurs within photosynthesis 2o H2O donates electrons to CHL and this is the source of oxygen in the generation of gas- Electrons are transferred from the pheophytin through and electron transport chaino Energy released from exergonic electron transfers is used to generate a proton gradiento The proton gradient allows ATP synthesis through phosphorylation reactions- Photons can be absorbed by the antenna complex and energy transfers will occur to the reaction center chlorophyll allowing the oxidation reactions to occurThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Photosynthesis confers autotrophy to plants:Carbon dioxide – used to build carbon skeletons, giving a source of oxygenWater – source of electrons, protons in light reactionsPhosphate – to generate ATP, build nucleotides, etc.Sulfate – to generate amino acidsNH4+ - to generate amino acids, nucleic acidsMinerals – iron, magnesium, copper,
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