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Light independent reaction/ Calvin cycle

OCR Biology
by

Tre Briercliffe

on 1 July 2013

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Transcript of Light independent reaction/ Calvin cycle

Light Independent Reaction
CO
2
RuBP (5C)
C
C
C
C
C
C
C
C
C
C
C
Rubisco
Produces 3 carbon compound...
Rubisco: Ribulose bisphosphate carboxylase-oxygenase
CO2 combines with RuBP
Ribulose Bisphosphate
5 atoms of carbon
What came first - respiration or photosynthesis
Where does the carbon dioxide come from?
light dependent recap: annotate the laminates
Results in production of two molecules of glycerate-3-phosphate (GP)
RuBP recieves a carbon from CO
2
2
CO fixed
C
C
C
C
C
C
C
C
C
C
C
C
+
RuBP
2
CO
GP
GP
ATP
i
ADP + P
NADP
Reduced NADP
GP is reduced and phosphorylated
ATP - energy
Reduced NADP
Triose phosphate (TP)
ATP
ADP
Needs ATP
Five out of every six TP recycled to make RuBp
Some TP used to make carbohydrates and lipids
Products of the Calvin cycle
3TP
Glycerol
Lipids
Hexose
sugars
e.g. glucose
starch
sucrose
fructose
cellulose
In this question, one mark is available for the quality of spelling, punctuation and grammar. In the palisade cells of a leaf, the fixation of carbon dioxide occurs in the Calvin cycle. Describe the main features of this cycle. No credit will be given for a flow diagram of the cycle.


Exam Question
Take 5
1.
5.
4.
3.
2.
Full transcript