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Summary Topic 5 - Energy Transfers - AQA A-level Biology £10.49   Add to cart

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Summary Topic 5 - Energy Transfers - AQA A-level Biology

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  • June 7, 2024
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  • 2023/2024
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Photosynthesis


LIGHT coz
v u
REDUCEDNADP

H2O LDR LIR GLUCOSE


ATP
82


Limiting factors

Light Intensity
coz conc
Temperature

If askedwhy increase in causesincrease in rate uptake of CO2
egg


In investigation whyis x kept constant
TEMP affects enzyme activity rate of Pass
Ensures only haseffecton rate ofPass


units for rate of Pass
CO2uptake 102 made glucose made per min see1hr


whyradioactively label substance

, Light dependent reaction
d
thylakoid i
space sunlight s

F M r

i


e carrier

th
morosystemit ecarrier
a a a
Noma a tho sotzetant s



Photo
ionisation
Photosystem II contains chlorophyll

chlorophyll absorbssunlight whichexcites electrons in chlorophyll
2 electrons perchlorophyllmolecule are lost


2 Photolysis of water
n
H2O to zé ant movesthroughAtpsynthasetocausecatalysis

wasteproduct replaces
e inchlorophyll


3 ElectronTransport Chain
seriesofredoxreactions
Electrons fromchlorophyllmovealongelectrontransportchain in thylakoidmembrane until findCar
Electroncarrierreducedwhengainingé and oxidised when e lost
movement of electrons releasesenergy for At of Ht ions

4 Chemiosmosis

H protons are pumped
byActivetransport from stroma thylakoid space
energy for At is fromelectronmovement originally from sunlight


5 Reduction of NADP
At final é carrier NADP is reduced by é andHt to form reducedNADP NADPH

NADP Ht e NADPH


6 Photophosphorylation
Ht protons movedown electrochemical gradient by facilitateddiffusion through Atpsynthase
Movement of HtcausesAtpsynthase to catalyse ADP pi ATP

, Light independentreaction
stroma
aka Calvincycle




1 GRUBP Scarbonmolecule ribulose Bisphosphate


6CO2
catalysed byrubiscoenzyme ribulosebisphosphatecarboxylase
carboxylation


I
usedtoregenerate IIP 3carbonmolecule glycerate 3 phosphate
GRUBP

g egg g g g
NADPtattata
YoIe'd't
releasesenergy
required ATP ADP Pi l releases energy for reaction




12TP 3carbon molecule triosephosphate




TP can also form glyceroland AA




Glucose 6carbonmolecule

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