Photosynthesis
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Photosynthesis. Light Absorption. Sun gives off visible light (ROYGBIV) Unabsorbed light reflects to our eyes Most green light not absorbed by leaves Chlorophyll absorbs sunlight Absorb mostly reds and blues. The Chloroplast. Site of photosynthesis

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Light absorption
Light Absorption

  • Sun gives off visible light (ROYGBIV)

  • Unabsorbed light reflects to our eyes

    • Most green light not absorbed by leaves

  • Chlorophyll absorbs sunlight

    • Absorb mostly reds and blues


The chloroplast
The Chloroplast

  • Site of photosynthesis

  • Thylakoid membranes: light dependent reactions

  • Stroma (fluid interior): light independent reactions



Photosynthesis overview
Photosynthesis Overview enter/exit

  • Two Stages

  • 1) Light Dependent Reactions

    • Photosystems: groups of molecules that capture/transfer energy

    • Creates: O2, ATP, NADPH

  • 2) Light Independent Reactions

    • Creates: Glucose


Light dependent reactions photosystem ii
Light Dependent Reactions: Photosystem II enter/exit

Step 1:

Chlorophyll absorbs sunlight

  • Chlorophyll e- become excited & transfer to thylakoid membrane

    • Thylakoid membrane becomes negatively charged

  • Starts an electron transport chain


  • Photosynthesis

    Step 2 & 3: enter/exit

    H2O broken into H+, e-, and O

    • e- replace those lost by chlorophyll

    • O waste

    • H+ pumped inside the thylakoids and accumulate


    Photosynthesis

    Thylakoid membrane enter/exit

    Thylakoid membrane becomes negatively charged

    e

    e

    e

    e

    e

    e

    e

    e

    e

    chlorophyll

    chlorophyll

    e

    e

    H

    e

    Electrons replace those which left chlorophyll

    H

    e

    e

    H

    O

    e

    H

    H

    H

    Oxygen waste is released

    O

    O


    Light dependent reactions photosystem i
    Light Dependent Reactions: Photosystem I enter/exit

    • Chlorophyll absorbs sunlight

      • Chlorophyll e- become excited & transfer to thylakoid membrane

        • Accumulate with those from photosystem II

    e-

    e-

    e-


    Photosynthesis

    • NADPH produced (H taxi) enter/exit

      • e- causes H+ to bond with NADP

    • ATP produced

      • H+ ions diffuse and bond ADP with Pi

    H+

    H+

    H+

    ATP

    ATP


    Light dependent summary
    Light Dependent Summary enter/exit

    • O2, ATP, NADPH created

    • NO GLUCOSE CREATED!


    Light independent reactions calvin cycle
    Light Independent Reactions (Calvin Cycle) enter/exit

    • Step 1: CO2 bonds with RuBP (5C) molecule to make a 6C molecule


    Photosynthesis

    6C molecule enter/exit

    RuBP

    CO2


    Photosynthesis


    Photosynthesis

    NADPH enter/exit

    6C molecule

    ADP

    ADP

    ATP

    ATP


    Photosynthesis

    Some PGAL (3C) bonds to make enter/exitglucose (6C)

    Some PGAL recycled to start the cycle over


    Photosynthesis

    glucose! enter/exit

    glucose!


    Light independent summary
    Light Independent Summary enter/exit

    • CO2, ATP, & NADPH create glucose


    Your essay question on the next test

    Your essay question on the next test! enter/exit

    Trace the flow of energy, including ATP, from the sun to your muscles, after eating a green leaf salad.