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Summary Alevel OCR Biology A notes on Photosynthesis

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Alevel OCR Biology A notes on Photosynthesis from an A* Biology student

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Photosynthesis permeable outer layer lice small
-
molecule (


I
-




chloroplasts double
-

membrane envelope inver membrace:
transport protein:certain morecules/inn can enter/leave


Stroma thylanoide (flatened shid filled sacs) 70s ribosomes DNAloop starch grains
= +
+ +




-




thylaucid membrace pigments, enzymes
=


election
+
carriers


-




Hylancial stack:
grana, connected by lamellal



grand membrane:large surface areat many pigment
4
molecules: light absorption plotosystems
=




selectivetransparproteinconnectareen




Merma
!)}@#5.
~>
3 envelope




asananaputs
grain



e





/ light absorptich

stroma
photosystems-t ylaloid membrace =
light independent

dI**I
d grana= light
absorb

light energy
dependent
7

surrounds grana
+
p roduct
membranes: transport rapid.

get like did has enzymes catalyse light independent stage
=




distance by pigmen
rf distance by scent
-
=

accessary pigments surrounding primary pigment:similar different
+


wavelengths

(yellow-green)
chlorophyle=a
chomarcgraphy
-




b
+


(blue-green):reflect green light


-carotenoids =
B carotere (orange) Xanthophyle
+



(yellow)
3 separated by




-light dependent thylaucids
=




-> plotolysis
-light energy break down water: hydrogen ion, electrons 02
+


Hylahcid
in lumen



=protongradient:4 cone & H wren
in


(ETC)
-electrons in
electron transport chain withmembrace


=
HT
OILRIG
NADPHproduced when s troma
in + electrons combine w/NADP


=plotophosphorylation ATP
=




-
-Plotophosphorylation excited
=


electrons move along ETC, electron carries reduced (gaindectrons +
oxidised (lose
->proton purp

electrons, gradually release actively transport
energy: protone across thylaloid membrace to



cycic" on cyclic wien=
proton graders:
p rotone return stroma
to via facilitated diffusion via transmembrane
↓ ↓

arePhoto batter- ATP synthase (chenicosmosis):ABD+Pi=AT
(PSI)


-




cyclic photophosphorylation:
election primary pigment
in excited to 4
energy wal (photoactivation), captured by


↓ electron acceptor



doesnt produce NADPH

Connected book
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Publisher: september 2015 ISBN: 9780198351924 Edition: 1

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