Oxygenic photosynthesis Flashcards
who can do oxygenic photosynthesis?
Algae,cyanobacteria
they use
lighe energy
they energy light for the purpose of ?
oxidizing H20
whats the pathway of the é?
é: photosystem 11 –photosystem 1—-NADPH
oxidizing of H20 liberates?
Oxygen
is it cyclic or non cyclic?
it’s non cyclic because é are used to produce PMF and NADPH
How do we do ATP
pmg in both cyclic and non cyclic
When the cell requires less NADPH,oxygenic phototrophs can ?
perform cyclic photophosphorylation
which means it is when6
reducing power is sufficient
therefore there is no need?
electron source
electron are going to return where?
photocomplex 11
in cyanobacteria where occurs oxygenic photosynthesis?
in cytoplasm
in eukaryotes where does accurs photosnthesis?
chloroplast,stroma
Who is the electron donor?
H20
sometimes some cyanobacteria in presence of H2S can do?
anoxygenic photosynthesis
why does it happens in presence of H2S?
because it inhibits PSII, H2S gives his electrons to the chain so no need of PSII
who is the electron donor in anoxygenic photo?
it’s H2S which is oxidized
when that happen is it cylic photophospho or non clycli6
it his cyclic photophosphorylatino
why is it cycle photophosrylation?
because also the production of NADPH is inhibited and electron come back
this cyclic photophosphorylation leads to ?
creation of pmf that drives ATP synthase
is the NADPH always inhibited?
not sometimes can produce still NADPH if it his only partially inhibited
