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Molecules are the basis of life. They can be considered as a quantum system. So it is necessary to enter quantum mechanics in biological discussions. In this paper we consider the DNA molecule as a quantum system. We discuss the relation between heredity, biology and DNA and quantum systems. We also find a relation between the quantum information and some bio-processes such as cell division, heredity, and cloning. Finally we conclude that in cell division, DNA-replication and cloning all information in DNA are different.