Guanine
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The number of guanine. In DNA, cytosine always pairs with guanine through hydrogen bonding. This relationship forms one of the complementary base pairs in the double helix structure of DNA.
Cytosine forms base pairs with guanine through three hydrogen bonds in DNA.
Chargaff's rule states that in a DNA molecule, the amount of adenine (A) equals the amount of thymine (T), and the amount of cytosine (C) equals the amount of guanine (G). To calculate this, you would count the number of A's and T's, and the number of C's and G's in a DNA sequence and compare them. The percentages should be approximately equal if Chargaff's rule holds true.
Cytosine From : PY Blain
A DNA molecule may have the same percentage of guanine and cytosine because they bond together through three hydrogen bonds, forming a stable base pair. This complementary pairing ensures that the total percentage of guanine always equals the total percentage of cytosine in a DNA molecule, known as Chargaff's rule.
Guanine-Cytosine