Photosynthesis lecture 2

Some steps in photosynthesis are not yet understood, but the following summary equation has been known since the early 1800’s. ,[object Object],[object Object],[object Object],[object Object]

Showing only the net consumption of water, simplifies the summary equation: ,[object Object],[object Object],[object Object]

The simplest form of the equation is: ,[object Object],[object Object],[object Object],[object Object]

The Splitting of Water ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],Photosynthesis is a Redox Process

The light reactions and the Calvin cycle cooperate in transforming light to the chemical energy of food Photosynthesis occurs in two stages:

Light reactions : ,[object Object]

These reactions ,[object Object],[object Object],[object Object],[object Object]

Calvin Cycle ,[object Object]

These reactions ,[object Object],[object Object]

Calvin Cycle ,[object Object],[object Object],[object Object]

Chloroplasts use light energy to make sugar by coordinating the two stages of photosynthesis. ,[object Object],[object Object],[object Object],[object Object]

The Nature of Light ,[object Object],[object Object],[object Object],[object Object]

Wave-like properties of light ,[object Object],[object Object],[object Object]

[object Object],[object Object],Wave-like properties of light

Particle-like properties of light ,[object Object],[object Object],[object Object]

[object Object],[object Object],Particle-like properties of light

Photosynthetic Pigments: The Light Receptors ,[object Object],[object Object]

Pigments ,[object Object],[object Object]

[object Object],[object Object],Pigments

Action Spectrum ,[object Object],[object Object]

Action Spectrum ,[object Object]

The action spectrum for photosynthesis does not exactly match the absorption spectrum for chlorophyll a . ,[object Object],[object Object]

Accessory Pigments ,[object Object],[object Object]

The Photoexcitation of Chlorophyll ,[object Object],[object Object]

Photoexcitation ,[object Object],[object Object]

[object Object],[object Object],Photoexcitation

Photosystems: Light-Harvesting Complexes of the Thylakoid Membrane ,[object Object],[object Object],[object Object],[object Object]

Photosystems: Light-Harvesting Complexes of the Thylakoid Membrane ,[object Object]

Two types of photosystems are located in the thylakoid membranes: ,[object Object],[object Object]

[object Object],[object Object],[object Object],Two types of photosystems are located in the thylakoid membranes:

Noncyclic Electron Flow ,[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],Noncyclic Electron Flow

The Light Reactions In Summary: ,[object Object],[object Object]

Then - ,[object Object],[object Object],[object Object]

and - ,[object Object],[object Object],[object Object],[object Object]

so that - ,[object Object],[object Object]

Cyclic Electron Flow ,[object Object]

[object Object],[object Object],[object Object],[object Object],Cyclic Electron Flow

Summary of the Light Reactions ,[object Object]

This process: ,[object Object],[object Object],[object Object]

and finally - ,[object Object],[object Object],[object Object]

The “Light-Independent” Reactions ,[object Object],[object Object]

Photosynthesis lecture 2

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Photosynthesis lecture 2