Cytosine Thymine Adenine Guanine

Cytosine Thymine Adenine Guanine. There is a second nucleic acid in all cells called ribonucleic acid, or RNA Figure 9.4 DNA (a) forms a double stranded helix, and (b) adenine pairs with thymine and cytosine pairs with guanine


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In the case of DNA, those bases are adenine, guanine, cytosine, and thymine The phosphate group of one nucleotide bonds covalently with the sugar molecule of the next nucleotide, and so on, forming a long polymer of nucleotide monomers.

One copy of the human genome consists of approximately 3 billion base pairs of DNA. In DNA, these bases are cytosine (C), thymine (T), adenine (A) and guanine (G).These bases attach in place of the -OH group on the 1' carbon atom in the sugar ring There is a second nucleic acid in all cells called ribonucleic acid, or RNA

3D illustration of DNA made by molecules called nucleotides. The four types of nitrogen bases. A and G are classified as purines, while C and T are classified as pyrimidines This image is linked to the following Scitable pages: DNA Is a Structure That Encodes Biological Information.

. Figure \(\PageIndex{2}\): (a) Each DNA nucleotide is made up of a sugar, a phosphate group, and a base.(b) Cytosine and thymine are pyrimidines The two strands are held together by hydrogen bonds between pairs of bases: adenine pairs with thymine, and cytosine pairs with guanine