With reference to lactose explain the meaning of the phrase glycosidic C-1 to C-4 linkage
http://en.wikipedia.org/wiki/Image:Lactose%28lac%29.png
The linkage refers to the #1 and #4 carbons in the rings as shown in the diadram.
The phrase "glycosidic C-1 to C-4 linkage" refers to a specific type of chemical bond between the carbon atoms in a molecule called lactose. Lactose is a disaccharide, which means it is composed of two sugar molecules: glucose and galactose.
In lactose, the glycosidic linkage is formed between the carbon atom at position #1 in the glucose molecule and the carbon atom at position #4 in the galactose molecule. This bond is a specific type of covalent bond known as a glycosidic bond. It is formed by a condensation reaction, where a molecule of water is released as the bond is formed.
The diagram you provided shows the structure of lactose, with the glucose molecule on the left and the galactose molecule on the right. The carbon atoms in the glucose molecule are labeled from C-1 to C-6, and the carbon atoms in the galactose molecule are labeled from C-1 to C-6.
The glycosidic C-1 to C-4 linkage is the bond between the carbon atom at position #1 in the glucose molecule and the carbon atom at position #4 in the galactose molecule. This bond is responsible for holding the two sugar molecules together in lactose.
Understanding the meaning of this phrase helps in understanding the structure and properties of lactose, as well as its role in biological processes such as digestion and lactose intolerance.