One of the four bases—adenine (A), cytosine (C), guanine (G) or thymine is joined to the each sugar (T). Adenine and thymine form the hydrogen bonds with cytosine and guanine, respectively, holding two strands together.
Two complementary DNA nucleotide bases make upt he base pair, which will together constitute a "rung of the DNA ladder." The structure of DNA is a double helix, which is made up of two connected strands that loop around the one another to resemble like twisted ladder. Deoxyribose and phosphate groups alternately form backbone of each strand.
Adenine (A), cytosine (C), guanine (G), and thymine (T) are four bases of DNA (T). These bases come in the particular pairs (A with T, and G with C).
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