Oxygenic/anoxygenic photosynthesis in the light reactions

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stage three of glycolysis

fermentation reaction

point of fermentation reaction

regenerate NAD+

fermentation is internally balanced?

the use of NADH requires the regeneration of NAD+

in the absence of gloucose compounds can make ATP via

substrate level phosphorylation

"energy-rich compounds involved"

high energy intermediates

most phototrophs are

autotrophs

using CO2 as sole carbon source requires

reducing power (high energy electrons have to be available to donate) and energy

"light reactions" require

reducing power and energy

dark reactions

CO2 fixing, regenerate supply

anoxygenic photosynthesis involves

MICROBES

anoxygenic photosynthesis requires

reducing power and energy

what are the donors that provide reducing power?

the photosystems; p680 is a good donor by splitting water (water supplies the reducing power)

p680 donating:

electrons donated, drops down to ground state. water is split to replenish electrons (water is the reducing power)

The Z scheme involves

green plants, algae, and cyanobacteria
** oxygenic

The Z scheme:

electrons can be passed down to p700,
becomes a better donor

p700 being a better donor makes ____ reducing power

NADPH

the different chloroplasts have

different R groups, absorb at different maximum wavelengths

where does ATP synthesis occur ?

membranes

ATPs chills where??

membrane

oxygenic photosynthesis

oxygen is the end product, generates reducing power

anoxic photosynthesis reducing power generate by

inorganic compounds

anoxygenic photosynthesis occurs in

purple bacteria, green sulfur/nonsulfur bacteria, gram positive, and acidobacteria

oxygenic electron flow

the Z scheme

1st step in Z scheme

splitting of water into oxygen and electrons

2nd step in Z scheme

p680 acts as a reducer and is then returned to its ground state potential (after it is reduced by an electron from water)

plastocyanin

donates electron to photosystem I

PS1 role

p700 accepts electron, eventually leads to the reduction of NAD+

ulitmately NAD+ IS

reduced to NADH

Z schemel

OXYGENIC
green plants, algae, cyanobacteria

anoxygenic photosynthesis

carries out cyclic photophosphorylation using only photosystem 1

Reducing power for Co2 anoxygenic

sources other than water

reducing power for CO2 oxygenic

water

anoxic bacteria

purple bacteria, green sulfur bacteria, heliobacteria

purple and green bacteria

preceded cyanobacteria (oxygenic; anoxygenic photosynthesis first form of photosynthesis on earth

purple bacteria

REVERSE ELECTRON FLOW to produce NADH

cyclic photophosphorylation:

P780
rhotobacter membranes

ferredoxin

can be used for reducing potential; better than NADH

ferredoxin can be used by

green sulfur bacteria and heliobacteria

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