BIO NMDCAT Carbohydrates

nmdcat.online June 27, 2026

A common intermediate in the metabolic pathways of both starch digestion and cellulose synthesis is

A. Glucose-1-phosphate

✓

B. Fructose-2,6-bisphosphate

C. Ribose-5-phosphate

D. Erythrose-4-phosphate

📝 Explanation

Starch digestion hydrolyzes starch to glucose, which is then phosphorylated to glucose-6-phosphate and isomerized to glucose-1-phosphate for entry into glycolysis. Cellulose is synthesized in plants from the activated monomer UDP-glucose, which is derived from glucose-1-phosphate.

📖 Additional Information

Glucose-1-phosphate
Fructose-2,6-bisphosphate
Ribose-5-phosphate
Erythrose-4-phosphate

Starch digestion hydrolyzes starch to glucose, which is then phosphorylated to glucose-6-phosphate and isomerized to glucose-1-phosphate for entry into glycolysis. Cellulose is synthesized in plants from the activated monomer UDP-glucose, which is derived from glucose-1-phosphate.

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