Vol. 5, Issue 2, Part C (2019)

Abstract
Oligosaccharides (carbohydrates) are composed from 2 to 10 simple units of monosaccharaides. Oligosaccharides possess many crucial functions in biological systems such as cell binding and cell recognition. The biological roles of oligosaccharides demonstrate to span the spectrum from those that are trivial, to those that are necessary for the growth, development, function or survival of an organism. Some general principles have been emerged. First, it is not easy to predict a priori the functions a given oligosaccharide on a provided glycoconjugate might be mediating, or their relative importance to the organism. Second, the sequence of same oligosaccharide may facilitate various functions at different locations within the same organism. Third, the more specific and promising biological functions of oligosaccharides are commonly mediated by unusual presentations of common-terminal sequences, unusual oligosaccharide sequences, or by further changes of the sugars themselves.