Unformatted text preview: r is a primary electron
acceptor which removes an excited electron
from the reaction center chlorophyll a. - – This starts the light reactions. • Each photosystem - reaction-center chlorophyll
and primary electron acceptor surrounded by an
antenna complex - functions in the chloroplast as
a light-harvesting unit. - electron acceptor grabs high energy electron and
moves it to electron transport chain 6 • Photosystem I has a reaction center
chlorophyll, the P700 center, that has an
absorption peak at 700nm.
• Photosystem II has a reaction center with
a peak at 680nm.
– The differences between these reaction
centers (and their absorption spectra) lie not in
the chlorophyll molecules, but in the proteins
associated with each reaction center. • These two photosystems work together to
use light energy to generate ATP and
NADPH. - non cyclic pathway is predominant one
• light reactions, there are two possible routes for
electron flow: cyclic and noncyclic.
• Noncyclic electron flow, the predominant route,
produces both ATP and NADPH.
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