Question

Which of the following is found in milk?

• A. maltose
• B. Sucrose
• C. Lactose
• D. Fructose

Answer 1

The correct option is C Lactose

Lactose is a disaccharide which is made up of galactose and glucose units joined together by a glycosidic bond. It is also known as milk sugar because it is found in milk. It can be broken down into galactose and glucose in the presence of enzyme lactase. In a few people (newborns and adults), lactase enzyme is not found. They cannot digest lactose which leads to a condition called lactose intolerance. Such people should avoid consuming milk or milk products.
Maltose is a disaccharide which is made up of 2 glucose units joined together by a glycosidic bond. It is also known as malt sugar and is found in cereals like barley, from which maltose syrup is obtained. It is also found in germinating seeds.
Sucrose is a disaccharide which is made up of glucose and fructose joined together by a glycosidic bond. It is also known as cane sugar (found in sugarcane), table sugar (commercially used sugar for food purposes), and commercial sugar. It can be broken down into glucose and fructose in the presence of enzyme sucrase.
Fructose is a hexose monosaccharide. It is the sweetest of all naturally occurring sugars because its sweetness index is very high. Seminal fluids also have fructose. Fructokinase enzyme is required to break down fructose and it is found in the hepatocytes of the liver. It is also known as fruit sugar because it is mostly found in fruits.