"Lactose is made up of 1 mol glucose & 1 mol galactose with a glycosidic c-1 to c-4 linkage..."

Please explain to me what a GLUCOSIDIC C-1 to C-4 LINKAGE is.

Much appreciated.

This site will show the linkage.
http://en.wikipedia.org/wiki/Image:Lactose%28lac%29.png

A glucosidic C-1 to C-4 linkage refers to the way in which two monosaccharides, in this case glucose and galactose, are connected to form a disaccharide molecule called lactose.

To understand this linkage, it is helpful to first understand the basic structure of a monosaccharide. A monosaccharide, such as glucose or galactose, is a simple sugar molecule consisting of carbon atoms, hydrogen atoms, and oxygen atoms arranged in a ring shape.

In the case of lactose, one molecule of glucose and one molecule of galactose are joined together. The linkage between these two monosaccharides occurs between the first carbon atom (C-1) of glucose and the fourth carbon atom (C-4) of galactose. This means that the oxygen atom located on the C-1 carbon of glucose forms a bond with the C-4 carbon of galactose.

The resulting molecule, lactose, has a characteristic structure in which the oxygen atom bridges the glucose and galactose molecules. The specific position of the oxygen atom establishes the designation of a C-1 to C-4 linkage.

You can visualize the structure of lactose and observe the glucosidic C-1 to C-4 linkage by referring to the image provided in the link you shared: http://en.wikipedia.org/wiki/Image:Lactose%28lac%29.png