Glycolysis: Pathway and Significance · NCERT Biology

Which step in glycolysis involves the use of inorganic phosphate (Pi) rather than ATP?

  1. Glucose → Glucose-6-P
  2. Fructose-6-P → Fructose-1,6-bisphosphate
  3. PGAL → 1,3-BPGA (using Pi)
  4. PEP → Pyruvate
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Correct answer: PGAL → 1,3-BPGA (using Pi)

The conversion of glyceraldehyde-3-phosphate (PGAL) to 1,3-bisphosphoglycerate (BPGA) uses inorganic phosphate from the cytosol. This is an oxidation-coupled phosphorylation step.

Difficulty: Medium Question 16 of 20

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