Which of the following metabolic conversions involved in glucose synthesis requires the direct expenditure of atp?
a. 3-phosphoglycerate --> 1,3-bisphosphoglycerate
b. glyceraldehyde-3-phosphate + dihydroxyacetone phosphate --> fructose-1,6-bisphosphate
c. fructose-1,6-bisphosphate --> fructose-6-phosphate
d. 1,3-bisphosphoglycerate --> glyceraldehyde-3-phosphate

3-Phosphoglycerate --> 1,3-biphosphoglycerate

Explanation:

The reaction of 3-Phosphoglycerate --> 1,3-biphosphoglycerate is one of the ten reactions involved in the biosynthesis of glucose, a process also known as gluconeogenesis. This reaction involves the participation of the enzyme Phosphoglycerate kinase, which catalyzes the transfer of one of the phosphate groups from the ATP to the 3-Phosphoglycerate in order to form 1,3-biphosphoglycerate. This then results in an endergonic reaction, as it requires energy for it to occur, and in this case, that energy comes from the ATP molecule, which by losing a phosphate group then becomes an ADP molecule.

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explanation:

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