PHOTOSYNTHESIS
THE CALVIN CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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RUDP
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An Unstable 6 Carbon Molecule
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PGA
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2 3-carbon molecules
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Detailed explanation-1: -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-2: -The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to a simple five-carbon molecule called RuBP. These reactions use chemical energy from NADPH and ATP that were produced in the light reactions.
Detailed explanation-3: -The most common pathway combines one molecule of CO2 with a 5-carbon sugar called ribulose biphosphate (RuBP). The enzyme which catalyzes this reaction (nicknamed RuBisCo) is the most abundant enzyme on Earth! The resulting 6-carbon molecule is unstable, so it immediately splits into two 3-carbon molecules.
Detailed explanation-4: -8.3 U 10 In the light-independent reactions a carboxylase catalyses the carboxylation of ribulose bisphosphate. One CO2 molecule enters the Calvin cycle and combines with a 5 carbon molecule called Ribulose bisphosphate (RuBP) to temporarily form a 6C molecule.