Glyceraldehyde-3-phosphate (GAP) is converted to 1, 3-bisphosphoglycerate (1, 3B

Question

Glyceraldehyde-3-phosphate (GAP) is converted to 1, 3-bisphosphoglycerate (1, 3BPG) as shown below. GAP + P_i + NAD^+doubleheadarrow 1, 3BPG + NADH delta G = +6.7 kJ middot mol^-1 Is this reaction spontaneous? The reaction shown above is coupled to the following reaction in which 1, 3BPG is converted to 3-phosphoglycerate (3PG): 1, 3BPG + ADPdoubleheadarrow 3PG + ATP delta G = -18.8 kJ middot mol^-1 Write the equation for the overall conversion of GAP to 3PG. Is the coupled reaction favorable? Place these molecules in order from the most oxidized to the most reduced.

Explanation / Answer

a)

the reaction will NOT be spontanous since it has a possitive change in Gibbs free energy, therefore, the reactants are favoured...

If this is couled

then

dG total = dG1+ DG2 = 6.7-18.8 = -12.1

therefore, this will be in fact favoured

Q39

oxidation state --> most oxygens/electrons

So...

LEast oxidize is B, CH4, since it has only hydrogens, no Oxygen

second, A, since it has C=O and C-OH, the oxygen here is 1/2 oxidized

finally

most oxidize state is CO2

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