BIO NMDCAT Carbohydrates

nmdcat.online June 27, 2026

A key regulatory difference between starch synthesis in plants and glycogen synthesis in animals is that the direct activated glucosyl donor for starch is

A. UDP-glucose

B. ADP-glucose

✓

C. GDP-glucose

D. CDP-glucose

📝 Explanation

In plants, ADP-glucose is the activated form used by starch synthase. In animals, UDP-glucose is the glucosyl donor for glycogen synthesis. This is a fundamental biochemical distinction between the kingdoms.

📖 Additional Information

UDP-glucose
ADP-glucose
GDP-glucose
CDP-glucose

In plants, ADP-glucose is the activated form used by starch synthase. In animals, UDP-glucose is the glucosyl donor for glycogen synthesis. This is a fundamental biochemical distinction between the kingdoms.

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