Fundamentals of Biochemistry: Life at the Molecular Level 5th Edition

Published by Wiley
ISBN 10: 1118918401
ISBN 13: 978-1-11891-840-1

Chapter 8 - Carbohydrates - Exercises - Page 243: 9

Answer

Galactose.

Work Step by Step

Lactose is a disaccharide consisting of 2 monosaccharides: D-galactose and D glucose. Therefore, when hydrolyzed, lactose gives a unit of D-galactose along with D-glucose. D-galactose is then treated with an alkali like calcium hydroxide where it undergoes isomerization to form a ketose, D-tagatose.
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