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DNA Polynucleotide
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Adenine (A)

Adenine is a type of purine base that is used to make one of the building blocks of DNA and RNA. It bonds with thymine in DNA.

Guanine (G)

Guanine is a type of purine base that is used to make one of the building blocks of DNA and RNA. It bonds with cytosine in DNA.

Cytosine (C )

Cytosine is a type of pyrimidine base that is used to make one of the building blocks of DNA and RNA. It bonds with guanine in DNA.

Thymine (T)

Thymine is a type of pyrimidine base that is used to make one of the building blocks of DNA. It bonds with adenine in DNA.

DNA strand

Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups.

Double bond

Adenine of one strand forms two hydrogen bonds with thymine of other strand

Triple bond

Guanine forms three hydrogen bonds with cytosine.