Question

how many moles of ATP and NADPH are required to convert 6 moles of co2 to fructose-6-phosphate? Write all the reactions included ?

#Aman mishra​

Answer 1

18 ATP and 12 NADPH are required to convert 6 moles of CO2 to fructose 6 phosphate.

Explanation:

From the Calvin Cycle where carbon fixation takes place from the reaction. Originally 3 moles of CO2 enters the calvin cycle forming Glyceraldehyde-3-phosphate this is an intermediate compound in the formation of fructose 6 phosphate. One more molecule of G3P enters the cycle and form glucose.

we can see

6CO2+ 18 ATP+12NADPH+ 12 H2O= C6H1206+18ADP+18Pi+12 NADP+ +6H+

The sequence of reaction is:

Ribulose-1,5-bisphosphate+ CO2 gives 3-Phosphoglycerate

3 Phosphogycerate+2ATP gives 1,3-Bisphosphoglycerate+ADP

1,3-bisphoglycerate+2NADPH gives glyseraldehyde -3-phosphate+NADP+

5 glyceraldehyde 3-phosphate+3ATP gives 3 Ribulose-1,5-biphophate+3ADP

glyceralsehyde 3-phosphate+dihydroxyacetone phosphate gives fructose-6-phosphate.

Carbon fixation is a process of conversion of carbon dioxide to organic compounds.

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Answer 2

18 ATP and 12 NADPH

Explanation:

The Calvin cycle is also called a light-independent reaction that usually takes place during photosynthesis and carbon fixation to convert carbon dioxide into the sugar glucose or fructose-6-phosphate.

The equation is -

$6CO_2+ 18ATP + 12NADPH^+ + 12H_2O$ =

$C_6H_1_ 20_6 + 18ADP + 18Pi + 12NADP^+ + 6H^+$

Reactions included are -

• Ribulose-1,5-bisphosphate + $CO_2$⇒ 3-Phosphoglycerate

• 3 Phosphogycerate + 2ATP ⇒ 1,3-Bisphosphoglycerate + ADP

• 1,3-bisphoglycerate + 2NADPH ⇒ glyseraldehyde-3-phosphate + $NADP^+$

• 5 glyceraldehyde 3-phosphate + 3ATP ⇒ 3 Ribulose-1,5-biphophate + 3ADP

• Glyceralsehyde 3-phosphate + dihydroxyacetone phosphate ⇒ fructose-6-phosphate.

The chemical equation of the overall reaction is as follows -

⇒ $3CO_2 + 6NADPH + 5H_2O + 9ATP$ → glyceraldehyde-3-phosphate (G3P)  

       ⇒Glyceraldehyde-3-phosphate (G3P) +$2H^+ + 6NADP^+ + 9ADP + 8Pi$(Pi = inorganic phosphate)

or,

$6CO_2+ 18ATP + 12NADPH^+ + 12H_2O$ ⇒$C_6H_1_ 20_6 + 18ADP + 18Pi + 12NADP^+ + 6H^+$

∴ 18 ATP and 12 NADPH are required to convert 6 moles of $CO_2$ to fructose 6 phosphate.