... less oxygen in its structure than RNA. There are four different types of nitrogen bases: adenine, thymine, cytosine, and guanine in DNA. The nucleotides are held together by covalent bonds into a chain of nucleotides. DNA is made of two chains or strands, called a double helix. The nitrogen bases pair up in a specific order. A pairs with T, C pairs with G and vice-versa. This is called the complementary base pair rule and it has a great importance in the function of DNA during cell divisions/replication and protein synthesis. The sequence of the nitrogen bases in a DNA molecule is extremely important because it is the genetic code. RNA: -made of one strand, contains uracil instead of thymine as a nitrogen base, the pentose sugar is ribose, contains one more molecule of oxygen. DNA: - made of two strands connected by hydrogen bonds, and it's shape is a ...

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