Photosystems

Photosystems

reaction center and light capturing \n complexes

Reaction center \n

a complex of proteins associated \n with chlorophyll a and an electron acceptor

\n Light capturing complexes \n

pigments associated \n with proteins

\n Photosystem 2: reaction center P680 \n ○ Absorbs light at 680 nm

Comes first in discovery

Photosystem 1: reaction center P700 \n ○ Absorbs light at 700 nm

Second in discovery

Light Reactions Inputs

● H2O \n ● ADP \n ● NADP+

Light Reactions Outputs

● O2 \n ● ATP \n ● NADPH

\n NADP+ is reduced to

NADPH

Calvin Cycle

is \n cyclic electron flow \n ● Uses ATP and NADH \n to reduce CO2 to sugar \n (G3P)

Calvin Cycle

1. Carbon fixation
2. Reduction
3. Regeneration of RuBP