Exam 1: Ch 19 Photophosphorylation Flashcards
heterotrophic cells
glycolysis/fermentation
aerobic respiration/anaerobic respiration
consume O2 and carbs, make CO2 and H2O
photosynthetic cells
photosynthesis
use CO2 and H2O
2 phases of photosynthesis
light rxns - photophosphorylation
dark rxns - carbon assimilation/Calvin Cycle
what do the light reactions requrie
hv
NADP+
ADP, Pi
what do the light reactions make?
NADPH, ATP
what do the dark reactions require
NADPH, ATP, CO2 (sometimes O2)
what dod the dark reactions make
NADP, ADP + Pi
carbs (glucose)
where does photophosphorylation take place?
chloroplast membrane
what do oxidation phosphorylation and photophosphorylation have in common?
oxidizible substrate
electron transport chain (membrane bound complexes)
H+ gradient
terminal e- acceptor
ATP synthase
how many complexes pump protons in chloroplast?
1 pump
rest of protons come from a reaction
how is photophosphorylation driven forward
light energy
what does light do
excites an e- in protein complexes
makes a poor e- donor a good e- donor by decreasing Enot prime
light is collected by…
LHCs in the inner thykaloid membrane
chlorophylls and carotinoids
when the e- is transported in the ETC it needs to be replaced…
P680 PS II’s e- is replaced by H2O, generates O2
P700 PS I’s e- came from plasocyanin, which came from H2O
PSI can function on its own in plants
cyclic e- flow
no H2O needed, but no O2 produced
makes ATP, H+ pumped
no NADPH made
