Photosynthesis Flashcards
what is the abosrption spectrum of chlorophyll a and b
400-500nm and 600-700nm
what structure in chlorophyll makes it good at absorbing light energy
the conjugated double bond system
what atom exists in chlorophyll
magnesium
what is the structural difference between chlorophyll and pheophytin
two hydrogen atoms replace the magnesium atom
why is the structure of pheophytin much more stable than chlorophylls
because of the hydrogen bond interactions
what is the P value of the special pair chlorophyll molecules
P960
what polypeptides form the photosynthetic reaction centre in Rhodoseudomonas?
4 polypeptides - L, M, H and cytochrome subunit.
what structures are similar to L and M?
The D2 and D1 structures of the PSII complex
what is an important complex of the PSII complex
the oxygen evolving complex
What is the P value for the special pair in PSII
P680
What does PSII reduce
plastoquinone
what oxidises the reduced plastoquinone
cytochrome b6f complex
what structure in the mitochondira is b6f complex homologous to?
bc1
what protein links the bc1 complez and cytochrome oxidase
plastocyanin
what is the special pairs P value in PS1
p700
what clusters does the PS1 complex consist of
3 4Fe-4S complexes
what does p700 eventually reduce?
Ferradoxin
what does ferrdoxin donate electrons to and what does this eventually cause?
Ferredoxin-NADP+ reductase which converts NADP+ to NADPH
what reduced photosystem I
plastocyanin
how is light energy transferred from one chlorophyll to another
by resonance energy transfer
