What is lactose composed of?
Understand the Problem
The question is asking for the chemical composition of lactose, which is a disaccharide sugar. It seeks to understand which monosaccharides make up lactose and its chemical structure.
Answer
D-glucose and D-galactose
Lactose is composed of D-glucose and D-galactose joined in a β-1,4-glycosidic linkage.
Answer for screen readers
Lactose is composed of D-glucose and D-galactose joined in a β-1,4-glycosidic linkage.
More Information
Lactose is commonly known as milk sugar and is found in the milk of mammals. It consists of one molecule of glucose and one molecule of galactose, making it a disaccharide.
Tips
A common mistake is thinking lactose is composed of two molecules of the same monosaccharide, but it is actually composed of one glucose and one galactose.
Sources
- Lactose - an overview | ScienceDirect Topics - sciencedirect.com
- Lactose - Wikipedia - en.wikipedia.org
- The web page with info on - Example Source - ncbi.nlm.nih.gov
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