photosynthesis 1 Flashcards
what is the principal light harvesting molecule
bacterio chlorophylls
what does the conjugated system in the chlorophyll do
makes it a good absorber of light energy
why do chlorophyll a and b not absorb properly in the green spectrum
because chlorophyll solutions are green
what else can affect absorbance characteristics
pigments are bound
how does electron drop back down to ground state
emission of heat or light along the wave
how do you get charge seperation
excited electron from initial excited molecule goes to nearby acceptor
what does light induced excitation result in
electron transfer to acceptor
oxidised donor
reduced acceptor
what are photosynthetic reaction centres
the protein complex where charge separation occurs
name some key parts of the rhodopseudomonas viridis reaction centre
heme
nonheme iron
quinone
bacteriopheophytin
bacteriochlorophyll
special pair
name the steps in the photosynthetic electron transport chain
1)light absorbed by P960 and oxidised
2) absorbed by bacteriopheophytin which is reduced after charge separation
3) quinone A reduced
4) heme is oxidised
5) quinone B reduced
6) proton comes in quinone B
7) quinone pool created
at the end of bacterial reaction centre QH2 is formed and it is reduced how does the respiratory chain reoxidise it
oxidised by complex III
what sort of process is the reoxidation of QH2
cyclic process that produce proton gradient anaerobically in presence of light
are electrons transferred from a bacteriopheophytin to a flavin molecule
no
what are the special pair of chlorophyll molecules
P960
electrons from the special pair go where
bacteriopheophytin
