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Chapter 8

Photosynthesis Light energy is captured and used to synthesize carbohydrates
Heterotrophs Must eat food to sustain life
Autotroph Make organic molecules from inorganic sources
Photoautotroph uses light as a source of energy
chloroplast Organelles in plants and algae that carry out photosynthesis
Chlorophyll Green pigment used in plants to produce sugars
Stomata Holes in a leaf through which carbon dioxide enters and oxygen exits
Thylakoid Membrane third membrane that contains chlorophyll pigment molecules
Granum Stack of thylakoids
Two Stages of Photosynthesis Light reactions and Calvin Cycle (light-independent reactions)
PSII Chlorophyll P680; excited electrons travel to PSI using water that is oxidized
PSI Chlorophyll P700; primary role is NADPH production
Noncyclic Electron Flow Electrons produced by the splitting of water molecules travel to PSII, PSI, and NADPH
Cyclic Electron Flow Electron cycling releases energy to transport H+ into lumen driving synthesis of ATP
Photosystem II (PSII) Light-harvesting complex or antenna complex, and reaction center
Light-harvesting complex Directly absorbs photons; energy is transferred via resonance energy transfer
Reaction Center P680 (excited state); relatively unstable, transferred to promary electron acceptor, electrons are removed from water to "replenish" P680
Z Scheme Zigzag shape of energy curve that invovles increases and decreases in the energy of an electron as it moves from water to PSII to PSI to NADP+
Calvin Cycle ATP and NADPH are used to make carbs; CO2 is incorporated into the carbs
Created by: ERD2015



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