Given below are two statements:
Statement I : ATP is utilized at three steps in glycolysis.
Statement II : First, ATP is used in converting glucose into glucose-6-phosphate. Second, ATP is used in the conversion of fructose- 6-phosphate into fructose-1-6- diphosphate and third ATP is utilized during the transformation of glyceraldehyde 3 phosphate to 1,3 -Bis phospho glycerate.
In light of the above statements, choose the most appropriate answer from the options given below.

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Statement I is correct, but statement II is incorrect.

Both Statement I and statement II are correct.

Both Statement I and statement II are incorrect.

Statement I is incorrect, but statement II is correct.

answer is D.

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Detailed Solution

. During glycolysis, glucose is converted into pyruvate, which involves a series of enzymatic reactions. The first step of glycolysis is the conversion of glucose to glucose-6-phosphate, which is catalyzed by the enzyme hexokinase and requires the input of one molecule of ATP. The second step involves the conversion of fructose-6-phosphate to fructose-1,6- bisphosphate, which is catalyzed by the
Enzyme phosphofructokinase and also requires the input of one molecule of ATP.

Thus, ATP is used at two steps in glycolysis: once in the conversion of glucose to glucose-6-phosphate and once in the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate.

In the next step where Glyceraldehyde 3 phosphate is oxidized to 1,3 Bis phospho glycerate,inorganic phosphate (pi) is used as a donor of phosphate group.