| Cellular nucleic acids exist in two forms, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Approximately 90% of the nucleic acid within cells is RNA, and the remainder is DNA. DNA is the repository of genetic information within the cell. This chapter deals with the structure of DNA, the manner in which it is stored in chromosomes in the nucleus, and the mechanisms involved in its biosynthesis and repair.
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