Photosynthesis: Light-dependent Reactions Flashcards
(17 cards)
What do you call the main pigments found
inside chloroplasts which trap energy from
light photons that drives photosynthesis?
Chlorophyll (greenpigment)
Carotenoids (yellow,orange,red,purple pigments)
(absorbs most energy in blue-violet and orange-red
light)
is the primary photosynthetic pigment in all higher plants, algae and the cyanobacteria
Chlorophyll a
(primarily absorbs blue light)
is found in virtually all higher plants and green algae
Chlorphyll b
the yellow pigment
Xanthophylls
It is the main photosynthetic pigment
Chlorophyll
involves splitting of water (H2O) molecules, liberating oxygen
in the process
The ligh-dependent reactions (light reactions)
Light reactions involves 2 photosystems
Photosystem II (P680) & Photosystem I (P700)
Products of Light-dependent Reactions (LDR)
O2, NADPH, ATP
also known as the “water-splitting photosystem”
Process in Photosystem II
Excited electron jumps off from the
reaction center (P680) and accepted by
the primary electron acceptor and then
passed to
plastoquinone (PQ)
Protons are pumped towards the stroma
through the _______________________ protein
ATP synthase
produces ATP by
phosphorylating ADP with inorganic
phosphate (Pi).
ATP synthase
ATP is produced in the ______________________ where light-independent reaction (Calvin
Cycle) occurs.
NADPH is also produced here
stroma side
also known as the “NADPH-producing photosystem”
Process in Photosystem I
Light energy is absorbed and excited
electron jumps off from the reaction
center (P700) and accepted and carried by
ferredoxin (Fd)
The free electron is then carried in a short
electron transport from ferredoxin to
NADP+ reductase
NADP+ accepts __________________ and a _____________________ as it becomes reduced to
NADPH (the other product of LDR).
2 electrons and hydrogen ion
