Light Reaction
Storyboard Description
The story of a light reaction
Storyboard Text
- I wonder why I'm green. Hmmm..
- To start the light reaction, light strikes a chlorophyll molecule in PSII and excites an electron to a higher energy state. The sun is hitting the trees, where the light reaction is occurring.
- PSII
- Wow!! I'm excited! I wonder where this ETC train is taking me?
- This electron (red circle) enters a protein complex called the Electron Transport Chain (train). The ETC transfers the electron to lower and lower states.
- Thank You Electron!
- Thylakoid Space
- I was on the ETC Train, and I met some H+ ions (blue circles) who wanted to get off at the thylakoid space, so I helped them by using my energy to push them off!
- Want some energy?
- Light strikes another chlorophyll molecule, this time in PSI. An electron from PSI gets excited and passed to the outside of the thylakoid.
- I'm excited to go!
- PSI
- So you're my replacement from PSII? Looks like they'll hire anyone nowadays.
- To outside of thylakoid
- The electron that is passed to the outside of the thylakoid is replaced by the electron from the ETC.
- Well, you wouldn't have needed to be replaced if you didn't get so excited that you just had to move outside the thylakoid.
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