First slide

Disaccharides

Question

Lactose is made of:

Moderate

A

$α$ -D-glucose only
B

$β$ -D-galactose and $β$ -D-glucose
C

$α$ -D -galactose and $β$ -D-glucose
D

$β$ -D-galactose and $α$ -D-glucose

Solution

Lactose is obtained by the condensation of one molecule of $β$ -D-galactopyranose (C₁- $β$ ) unit and one molecule of $β$ -D lucopyranose (C₄ - $β$ ) unit.

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