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Biology Unit 4
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Topic 5: On the wild side
6. Describe the light-independent reactions as
reduction of carbon dioxide using the products of the
light-dependent reactions (carbon fixation in the
Calvin cycle, the role of GP, GALP, RuBP and RUBISCO)
and describe the products as simple sugars that…

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Biology Unit 4
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A 5-carbon sugar RuBP combines with CO in a process known as carbon fixation. This is
catalysed by a RuBISCO enzyme, forming an unstable 6C molecule. This quickly breaks down
forming 2 molecules of a 3-carbon compound GP (2 x 3C)
The GP is reduced…

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