Photosynthesis, Carbon Fixation And - Research Article from Macmillan Science Library: Plant Sciences

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Photosynthesis, Carbon Fixation And

C3 Photosynthesis.

Many important biological processes are sustained by cycles that continuously consume and renew one or more key intermediates while producing some other major product. Photosynthesis is sustained by the Calvin-Benson cycle.

The C3 photosynthetic mechanism is so named because the carbon atom of a molecule of CO2 taken up by an illuminated leaf is first detected in the three-carbon compound 3-phosphoglyceric acid (PGA). The vast majority of higher plants and algae are C3 species. PGA is formed when CO2 combines with a 5-carbon sugar, ribulose biphosphate (RuBP). The reaction is catalyzed by the enzyme RuBP carboxylase/oxygenase, an abundant protein in all green tissues. This multifunctional enzyme has come to be called rubisco.

During each turn of the Calvin-Benson cycle, two molecules of PGA (a total of six carbon atoms) undergo a complex series of enzyme-catalyzed transformations in which the...

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This section contains 2,215 words
(approx. 8 pages at 300 words per page)
Buy the Photosynthesis, Carbon Fixation And Encyclopedia Article
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Macmillan Science Library: Plant Sciences
Photosynthesis, Carbon Fixation And from Macmillan Science Library: Plant Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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