Question

Oxidation of glucose to CO${}_2$ and water occurs during

• A. Glycolysis
• B. Pentose phosphate pathway
• C. Krebs cycle
• D. All of the above

Answer 1

Answer: (B)

Pentose phosphate pathway

Pentose phosphate pathway is the only pathway in which glucose is completely oxidised to CO${}_2$ and H${}_2$O. It is also called HMP (hexose monophosphate shunt) as it is an alternate pathway to glycolysis. The primary substrate glucose is first phosphorylated to glucose-6-phosphate in presence of G6PD by consuming 1 ATP. A net gain of 35 ATP is achieved by oxidation of 1 molecule of glucose.

So the answer is 'Pentose phosphate pathway'.