Illustration of the four nucleotide bases found in DNA (deoxyribonucleic acid). The four bases are adenine (A), thymine (T), cytosine (C) and guanine (G). Adenine and thymine always pair together and cytosine and guanine always pair together. Each nucleotide is attached to a sugar phosphate strand (far right and far left). The bases are joined by hydrogen (H) bonds (yellow dots). The sequence of the nucleotide bases makes up the genetic code.

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Photo credit: © FRANCIS LEROY, BIOCOSMOS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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