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)
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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

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3
Q

What do cyanobacteria have instead of an antenna complex?

A

Phycobilisome

  • embedded with Bilin instead of chlorophyll
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4
Q

What are the three different bilin pigments

A

Phycocyanin (PC)

Phycoerythrin (PE)

Allophycocyanin (APC)

each with different light absorbing properties

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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
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