Photosynthesis

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Chlorophyll b is an accessory pigment

Chlorophyll b acts indirectly in photosynthesis by transferring the light it absorbs to chlorophyll a

Like chlorophyll a, it absorbs red & blue light and REFLECTS GREEN

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The Biochemical Reactions

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It Begins with Sunlight!

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Photoautotrophs Absorb Light Energy

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Inside A Chloroplast

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Structure of the Chloroplast

Double membrane organelle

Outer membrane smooth

Inner membrane forms stacks of connected sacs called thylakoids

Thylakoid stack is called the granun (grana-plural)

Gel-like material around grana called stroma

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Function of the Stroma

Light Independent reactions occur here

ATP used to make carbohydrates like glucose

Location of the Calvin Cycle

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Thylakoid membranes

Light Dependent reactions occur here

Photosystems are made up of clusters of chlorophyll molecules

Photosystems are embedded in the thylakoid membranes

The two photosystems are:

Photosytem I

Photosystem II

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Photosynthesis Overview

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Energy Carriers

Nicotinamide Adenine Dinucleotide Phosphate (NADP+)

NADP+ = Reduced Form

Picks Up 2 high-energy electrons and H+ from the Light Reaction to form NADPH

NADPH carries energy to be passed on to another molecule

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NADPH

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Light Dependent Reactions

Occurs across the thylakoid membranes

Uses light energy

Produce Oxygen from water

Convert ADP to ATP

Also convert NADP+ into the energy carrier NADPH

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Light Dependent Reaction

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Light Dependent Reaction