Summary
OCR Biology A-Level Photosynthesis Summary
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A HandWritten summary which contains all the necessary A* Content for Photosynthesis at OCR A-Level Biology.
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Granum : Stacks of thylanoidsThylanoids :
flattened sacs formed by the membrane
Lamellae Granum joined membranous Channels
by
:
Chlorophyll Green pigment which absorbs
light
:
Light-dependent stage of photosynthesis
Non-cyclic photophosphorylation
·
:
absorbed
Light
1 is
exciting electrons in the
photosystem 2 centre
.
,
2 .
Electrons are
passed to an electron
transport chain
producing some ATP
by chemiosmosis
.
3
Electrons lost from PS2 are
replaced with electrons produced by photolysis
4.
Electrons arive at PSI and are
again passed to an electron transport chain
s .
These electrons
along with anttion are accepted by the NADP
Coenzyme
6 reduced
NADP is
producing NADPH for other
processes
.
Photolysis
·
:
↳ breaus water down into 02 2H+ and Ze
Energy from the sun ,
↳The Le PS2
replaces dectrons lost from the centre
↳ 2H+ reduction of NADP
Catalyses the to NADPH
Cyclic Phosphorylation
·
:
↳ Electrons
leaving the transport chain after psi can return to PSI rather than
reducing NADP
↳ PSI NADPH
can still produce ATP but not
light independent photosynthesis :
Takes place in the stroma
using
NADPH and ATP
Calvin Cycle :
.CO2 is combined with Ribulose bisphosphate (Scarbon molecule) by RuBis Co enzyme
2 .
Unstable six carbon compound forms and breaks down into two three carbon
Glycerate 3-phosphate (GP) molecules
NADPH and
light dependent turn ap triose phosphate (TP)
3 .
ATP from the reactions into
4 Most TP is recycled Ribulose bisphosphate and synthesise
.
to
regenerate complex
molecules .
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