AP Biology Light Dependent Reactions – Electron Transport Chain.

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Presentation transcript:

AP Biology Light Dependent Reactions – Electron Transport Chain

Valence Electrons

Energy and Atoms Third energy level (shell) Second energy level (shell) First energy level (shell) Atomic nucleus Energy absorbed Energy lost

Photosynthesis Light Reaction

Non-cyclic electron flow

Non-cyclic Electron Flow *** Electrons start in photosystem II, and move through Photosystem I, as they work their way to NADPH. Along the way, they help to pump H+ to allow for the creation of ATP. The electrons do not return to where they came from.*** Photosystems – protein complexes that contain chlorophyll (and other pigments). These structures funnel light energy to the Mg atom for the ETC. Accessory proteins – these help to move excited electrons down the ETC in a series of REDOX reactions.

Redox reaction

Where it is occurring?

Water and Photosystems 1 and 2

Cyclic electron flow

Cyclic Electron Flow *** Electrons start in photosystem I and move through several accessory proteins. The main function of these electrons is to pump H+ so that ATP can be made. These electrons DO return to where they came from.*** Photosystems – protein complexes that contain chlorophyll (and other pigments). These structures funnel light energy to the Mg atom for the ETC. Accessory proteins – these help to move excited electrons down the ETC in a series of REDOX reactions.

Where it is occurring?

More surface srea = More energy

(How many electrons are in Mg’s outer shell?) Chlorophyll A or B molecule.

Answer: 2 Those 2 electrons will leave Mg and enter into the Electron Transport Chain.

Photosystem and collecting sunlight energy.

Non-cyclic electron flow

H+ (protons) being pumped into the thylakoid to “build” potential energy.

Non-cyclic electron flow

Cyclic electron flow

Cytochrome C ALL organisms have this important proton pumping protein

Potential Energy

Turning Potential energy into Kinetic energy to make ATP

Chemiosmosis and Energy Coupling.

Photosynthesis Light Reaction converts Sunlight into chemical energy

Calvin Cycle uses chemical energy to build sugar