Cytosine Thymine Adenine Guanine

Cytosine Thymine Adenine Guanine. Note the similarity of the shapes of adenine and guanine, and also the similarity between cytosine and thymine In the case of DNA, those bases are adenine, guanine, cytosine, and thymine


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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

The 5' to 3' (read "5 prime to 3 prime") directions are: down the strand on the left, and up the strand on the right. Attached to each sugar is one of four bases: adenine (A), cytosine (C), guanine (G) [GWA-NeeN] or thymine (T) The two strands are held together by hydrogen bonds between pairs of bases: adenine pairs with thymine, and cytosine pairs with guanine

. A and G are classified as purines, while C and T are classified as pyrimidines Two hydrogen bonds are formed between adenine and thymine, but three hydrogen bonds hold together guanine and cytosine (Figure 2.127).

DNA Structure. Adenine, Cytosine, Thymine, Guanine, Sugar Phosphatebackbone, and Hydrogen Bond. Figure 9.4 DNA (a) forms a double stranded helix, and (b) adenine pairs with thymine and cytosine pairs with guanine Joining the nucleotides into a DNA strand; Building a DNA chain concentrating on the essentials ; Joining the two DNA chains together; A final structure for DNA showing the.