Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYMODEL PAPER 65 Marks
Question
Describe the pentose phosphate pathway.
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Answer
Pentose Phosphate Pathway: The glucose is broken down into $CO _2$ and water during aerobic respiration. It is the principal pathway of respiration. Oxidation of glucose also takes place by another pathway called the pentose phosphate pathway. In this pathway, glucose 6-phosphate (6C) produced during the early stages of glycolysis (photosynthates produced during photosynthesis are oxidized to give rise to 6-phosphogluconate). The reaction occurs in the presence of the enzyme called glucose-6-phosphate dehydrogenase. It generates NADPH. The 6-phosphogluconate molecule is again oxidized by the enzyme. 6-phosphogluconate dehydrogenase. After this one molecule, each of ribulose-5-phosphate, carbon dioxide, and NADPH are formed. Ribulose-5-phosphate undergoes many changes to produce intermediates like glyceraldehyde-3-phosphate and fructose-6- phosphate. All these reactions occur in the cytoplasm of the cells.
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