What is DNA?
Some sequences of DNA have structural purposes. DNA consists of two units called "nucleotides" which are made up of sugars and phosphate groups. These two strands run in opposite directions of each other. Attached to each sugar is one of four molecules called bases. It is the sequence of these four bases that encode information; the genetic code. DNA is organized into structures called chromosomes which are duplicated before cells divide. DNA knows how to make copies of itself through a process called DNA replication.
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