Photosynthesis: energy- and carbon-capture Flashcards
1
Q
In what ways can electrons return to their ground state?
A
Releasing energy via:
- florescence
(emit light at higher wavelengths than absorbed
- resonance
(transfer vibration energy to nearby molecules) - electron transfer
(excited electron is transferred to an acceptor molecule)
2
Q
What is the function of the antenna complex of photosystems?
A
funnel excited electrons to the photochemical reaction centre by resonance transfer/ florescence.
there it is used to promote charge separation
3
Q
What do cyanobacteria have instead of an antenna complex?
A
Phycobilisome
- embedded with Bilin instead of chlorophyll
4
Q
What are the three different bilin pigments
A
Phycocyanin (PC)
Phycoerythrin (PE)
Allophycocyanin (APC)
each with different light absorbing properties
5
Q
How do the different bilin pigments work together?
A
PE:
- absorbs green light
- remits it as orange light
PC:
- absorbs orange light
- remits it as red light
APC:
- absorbs red light
- remits it at the exact wavelength of light need by chlorophyll