Which of the following steps during glycolysis is associated with utilisation of ATP?

Options

A. Glucose `rarr` Glucose -6-phosphate
B. Fructose-6-phosphate `rarr` Fructose-1,6-biphosphate
C. PEP `rarr` Pyruvic acid
D. Both (a) and (b)

Answer

D

Explanation

In the initial phase (energy spendling phase) of glycolysis, the hexoses (i.e., glucose and fructose) ar phosphorylated in a reaction that uses ATP at two steps : First in the conversion of glucose into glucose-6-phosphate and second in the conversion of fructose-6-phophaste to fructose-1,6-biphosphate.
These reactions are catalysed by the hexokinase and phospho-fructokinase respectively
`"Glucose + ATP" underset(Mg^(2+))overset("hexokinase")(rarr) "Glucose-6-phosphate + ADP"`
`"Fructose-6-phosphate + ATP" underset(Mg^(2+))overset("Phosphofructokinase")(rarr) "Fructose-1,6-biphosphate + ADP"`