8 Questions
Where does the light-dependent reaction take place within the chloroplast?
Thylakoid membrane and thylakoid space
What creates an electron gradient between the stroma and the fluid in the thylakoid space?
Moving electrons across proteins in the thylakoid membrane
What is the end result of the light-dependent reaction?
ATP
What absorbs light in photosystem II?
Chlorophyll molecules
Where do the new electrons come from to replace the ones lost by chlorophyll?
Water molecules (H2O)
What is the function of the thylakoid membrane in the light-dependent reaction?
The thylakoid membrane is where electrons are moved across proteins to create an electron gradient.
What is the role of chlorophyll in photosystem II?
Chlorophyll absorbs light and raises electrons to a higher energy level.
Where do the new electrons come from in the light-dependent reaction?
The new electrons come from water molecules (H2O).
Study Notes
Light-Dependent Reaction
- Takes place in the thylakoid membrane and thylakoid space within the chloroplast
- Involves the movement of electrons across proteins that form an electron transport chain in the thylakoid membrane
- Creates an electron gradient between the stroma in the chloroplast and the fluid in the thylakoid space
Role of Chlorophyll
- Chlorophyll molecules in photosystem II absorb light
- Absorption of light raises electrons in chlorophyll to a higher energy level
- High-energy electrons are passed from chlorophyll to the electron transport chain
Electron Transport Chain
- Series of electron carrier proteins that shuttle high-energy electrons
- Receives high-energy electrons from chlorophyll
- Plays a crucial role in generating ATP
Replacement of Electrons
- Thylakoid membrane contains a system that provides new electrons to chlorophyll
- New electrons come from water molecules (H2O)
- Replaces the electrons lost by chlorophyll during the light-dependent reaction
Test your knowledge on the light-dependent reaction in photosynthesis, including the location, electron transport chain, electron gradient, and the production of ATP.
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