DAT Photosynthesis Cheat Sheet Flashcards
what absorbs energy from sunlight
Chlorophyll A, B, and carotenoids
what excites the electrons
photons
what is energy absorbed by
by Chlorophyll A molecules, P680 (PSII) & P700 (PSI)
the two overall reactions of photosynthesis are..
light rxns and dark rxns (aka Calvin cycle)
what are electrons trapped by in light rxn
photosystem ii
what are the excited e- passed to
a primary e- acceptor
where do primary e- acceptors go to
move thru the ETC
what happens to the 2e- from the primary electron acceprot
lose their energy, used to form about 1.5 ATP
where does the ETC end
PSi
Cyclic Phosphorylation
2 e- from PSI go back through the
1st ETC and generate 1 ATP
Non-Cyclic Phosphorylation
2 e- go through an ETC and
combine with NADP+ & H+ to
form NADPH
what is NADH from non cyclic used for
in Calvin cycle to create glucose
purpose of Calvin cycle
Fixes Carbon Dioxide (CO2) into glucose (2 G3P).
Carboxylation: rxn
6 CO2 + 6 RuBP à 12 PGA
what is carboxylation catalyzed by
RuBisCO
Reduction:
12 ATP + 12 NADPH converts 12 PGA to 12 G3P or
12PGAL
Regeneration:
6 ATP convert 10 G3P to 6RuBP
steps of Calvin cycle
carboxylation, reduction, regeneration, carbohydrate synthesis
Chloroplasts are highly
effective at absorbing what colors
red and blue light
Photolysis
H2O splits into 2H+, 2e-
, and 1⁄2 O2.
where does photolysis occur
PSii
what membrane does chemoosmosis occur at
thylakoid membrane
what is chemosmosis
Uses H+ gradient to create ATP.
where does H+ accumulate in chemiosmosis
thylakoid lumen
