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Question
In which of the following options, correct words for all three blanks A, B and C are indicated?
In which of the following options, correct words for all three blanks A, B and C are indicated?
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Solution
The correct option is C A- Fixation, B- Decarboxylation, C- Regeneration
The first step in the pathway is the conversion of pyruvate to phosphoenolpyruvate (PEP), by the enzyme pyruvate orthophosphate dikinase. This reaction requires inorganic phosphate and ATP plus pyruvate, producing phosphoenolpyruvate, AMP and inorganic pyrophosphate (PPi). The next step is the fixation of CO2 ( step 'A') into oxaloacetate by the enzyme PEP carboxylase. Both of these steps occur in the mesophyll cells.
The product is usually converted to malate, a simple organic compound, which is transported to the bundle-sheath cells. Here, it is decarboxylated to produce CO2 and pyruvate (step 'B'). The CO2 now enters the Calvin cycle and the pyruvate is transported back to the mesophyll cell (step 'C'). So, it is called as regeneration. So, the correct answer is 'A- Fixation, B- Decarboxylation, C- Regeneration'
The first step in the pathway is the conversion of pyruvate to phosphoenolpyruvate (PEP), by the enzyme pyruvate orthophosphate dikinase. This reaction requires inorganic phosphate and ATP plus pyruvate, producing phosphoenolpyruvate, AMP and inorganic pyrophosphate (PPi).
The next step is the fixation of CO2 ( step 'A') into oxaloacetate by the enzyme PEP carboxylase. Both of these steps occur in the mesophyll cells.
The product is usually converted to malate, a simple organic compound, which is transported to the bundle-sheath cells. Here, it is decarboxylated to produce CO2 and pyruvate (step 'B'). The CO2 now enters the Calvin cycle and the pyruvate is transported back to the mesophyll cell (step 'C'). So, it is called as regeneration.
The product is usually converted to malate, a simple organic compound, which is transported to the bundle-sheath cells. Here, it is decarboxylated to produce CO2 and pyruvate (step 'B'). The CO2 now enters the Calvin cycle and the pyruvate is transported back to the mesophyll cell (step 'C'). So, it is called as regeneration.
So, the correct answer is 'A- Fixation, B- Decarboxylation, C- Regeneration'
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