What do you call a double sugar that consists of two monosaccharides joined by dehydration synthesis?

A double sugar that consists of two monosaccharides joined by dehydration synthesis is referred to as a disaccharide. This process occurs when two monosaccharides, such as glucose and fructose, undergo a chemical reaction where a water molecule is removed, allowing the two sugars to bond together. The resulting product is a disaccharide, which is characterized by having two sugar units.

Disaccharides serve various functions in biology, including as a source of energy and as building blocks for larger carbohydrate structures. Common examples include sucrose (table sugar) made from glucose and fructose, and lactose, which is composed of glucose and galactose. Understanding the formation and function of disaccharides is essential in the study of carbohydrates and their role in biological systems.