After carbon fixation, what happens to glucose?

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Multiple Choice

After carbon fixation, what happens to glucose?

Glucose from carbon fixation is funneled into the cell’s central metabolism to provide both energy and the building blocks for growth. It is typically phosphorylated to glucose-6-phosphate and then enters glycolysis and the pentose phosphate pathway. Glycolysis breaks glucose down to pyruvate, yielding ATP and NADH for energy. The pentose phosphate pathway generates NADPH for biosynthetic reactions and ribose-5-phosphate for nucleotide synthesis. Pyruvate can be turned into acetyl-CoA and enter the TCA cycle, producing more ATP and reducing equivalents and supplying precursors for amino acids, lipids, and other biomolecules. So glucose supports energy production and the synthesis of cellular biomass, not just energy. In microbes, excess glucose is often stored as glycogen rather than starch.

Glucose from carbon fixation is funneled into the cell’s central metabolism to provide both energy and the building blocks for growth. It is typically phosphorylated to glucose-6-phosphate and then enters glycolysis and the pentose phosphate pathway. Glycolysis breaks glucose down to pyruvate, yielding ATP and NADH for energy. The pentose phosphate pathway generates NADPH for biosynthetic reactions and ribose-5-phosphate for nucleotide synthesis. Pyruvate can be turned into acetyl-CoA and enter the TCA cycle, producing more ATP and reducing equivalents and supplying precursors for amino acids, lipids, and other biomolecules. So glucose supports energy production and the synthesis of cellular biomass, not just energy. In microbes, excess glucose is often stored as glycogen rather than starch.

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