Please enable JavaScript.
Coggle requires JavaScript to display documents.
Biochemistry of Photosynthesis - Coggle Diagram
Biochemistry of
Photosynthesis
Light Dependant Stage
location
thylakoid membranes of chloroplasts
products
ATP and reduced NADP
overview
light energy = split water by photolysis
produced:
oxygen
ATP
reduced NADP
questions asked
-
what happens when light strikes chlorophyll molecule?
how ATP produced in LDS of photoS?
effect light on PPSI + PSII?
process
light strikes the chlorophyll
molecules in PSI and PSII
in PSII
light energy trapped
2 electrons
promoted
to higher
energy level
electrons picked up by
electron acceptor
molecule
electrons pass through
electron carrier system
to PSI
transfers cause energy to be released
through OX + RED reactions
used convert
ADP to ATP
(photophosphorylation)
light energy converted to chemical energy
2 electrons are
boosted
to
an even higher energy level
picked up by second
electron acceptor molecule
Photolysis
from split water molecule...
2 e-s
replace e-s
lost
from chlorophyll molecules
in
PSII
@ start
protons
combine with e-s
(from 2nd electron acceptor molecule)
form
2 H+
used to reduce NADP to
NADPH + H+
oxygen
(1/2O2)
released into
atmosphere
electrons from
PSI either:
pass through carriers to produce ATP
and are recycled to PSI
(
cyclic phosphorylation
)
combine with protons released
from water to
reduce NADP
Equation
Light Independent Stage
Calvin Cycle
location
stroma of chloroplasts
products
sugars
reactions are
DEPENDANT
on
products
from light dependant stage
NADPH + H+
provides H
for conversion of glycerate-3-phosphate
into triose phosphate
ATP
provides energy
AND
provides phosphate for regeneration of ribulose biphosphate
overview
CO2 fixed
by combining it with RuBP
using enzyme RUBISCO
process
CO2 diffuses into leaf
through stomata
dissolves in moisture
(on walls of palisade cells)
diffuses through:
cell membrane
cytoplasm
chloroplast membranes
to STROMA
each CO2 (6 molecules) combine with ribulose biphosphate (RuBP)
(5C compound)
forms unstable 6C intermediate
reaction catalysed by RUBISCO
each 6C intermediate breaks down
into 2 molecules of 3C compound
Glycerate-3-phosphate
(12 molecules)
GP reduced to triose phosphate
ATP provides energy
reduced NADP provides a hydrogen
(NADP+ regenerated + returns to
light stage to accept another H)
2 TP
molecules combine
to form
HEXOSE SUGAR
(glucose)
further polymerised to form starch
10 TP
molecules used to
regenerate 6 molecules of RuBP
ATP provides phosphate
Definitions
Photolysis
water molecule dissociates into
protons, electrons + oxygen gas