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g Synthesis of some disaccharides relies on the activation of glucose by UTP to form UDP‑glucose. First, UDP‑glucose is converted to UDP‑galactose. UDP - glucose UDP - galactose - 4 - epimerase ⇌ UDP - galactose Then, UDP‑galactose is combined with another glucose unit to form a disaccharide. Identify the disaccharide.

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Answer: Lactose

Explanation:

Lactose is a sugar present in milk is produced from the glycosidic linkage of galactose and glucose. The anomeric carbon atom of beta-galactose is attached to the 4th hydroxy group of glucose through beta-1, 4 glycosidic linkage.

Galactose an epimer of glucose is produced in the initial steps when glucose is activated by UDP to form UDP-glucose it can be epimerized to Galactose.

When a galactose subunit is combined with another glucose units through a glycosidic linkage it forms a disaccharide Lactose.

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