Photosynthesis Flashcards
Where does photosynthesis occur?
Chloroplasts!
- Light reactions take place in the thylakoid
- Calvin cycle takes place in the stroma
What are main energy forms used in photosynthesis? For what?
- NAD is used to accelerate sugar oxidation
- NADPH is used for reduction to make sugars
ATP!
When light is absorbed, what does this do to electrons?
The absorption of light causes an electron transition to a higher energy level
Why are chlorophylls and carotenoids suited for specific wavelengths?
There are double bonds at different spots causing delocalized electrons- causing them to be best suited for specific wavelengths
What are best wavelengths for Chorophyll?
Chlorophyll is best suited to absorb red and blue light (400-450 and 650-700)
- transmit green light
What are best wavelength for carotenoids?
Absorb blue and green (450-475)
Transmit yellow and orange light
What happens to an electron when excited?
Resonance energy transfer: electron falls to ground state and energy is used to excite the next chlorophyll
How does Resonance energy Transfer affect wavelengths?
Wavelengths slowly increase
Where does final electron in Resonance energy transfer go?
Jumps to ETC- shuttled through proteins by Plastoquinone
What is photophosphorylation?
Using light energy to convert ADP to ATP
What is Carbon fixation?
Carbon fixation- rubisco attached to CO2 to give glucose with the help of ATP and NADPH
