TREE PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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To attach ("affix") CO2 to RuBP
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To phosphorylate RuBP
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To rearrange 10 3C molecules to 6 5C molecules
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To synthesize glucose
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Detailed explanation-1: -An enzyme, RuBisCO, catalyzes the fixation reaction, by combining CO2 with RuBP. The resulting six-carbon compound is broken down into two three-carbon compounds, and the energy in ATP and NADPH is used to convert these molecules into G3P.
Detailed explanation-2: -RuBisCO catalyzes a reaction between CO2 and RuBP, which forms a six-carbon compound that is immediately converted into two three-carbon compounds. This process is called carbon fixation, because CO2 is “fixed” from its inorganic form into organic molecules.
Detailed explanation-3: -Ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco; EC 4.1. 1.39) catalyzes the addition of gaseous carbon dioxide to ribulose-1, 5-bisphosphate (RuBP), generating two molecules of 3-phosphoglyceric acid (3-PGA), and is thus the key enzyme in CO2 assimilation.
Detailed explanation-4: -Rubisco can bind to either carbon dioxide or oxygen depending on environmental conditions. Binding to carbon dioxide and initiation of the Clavin cycle is favored at low temperatures and at a high carbon dioxide-to-oxygen ratio.