In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of thymine.
DNA:
- The DNA molecule is a double-stranded molecule made up of nucleotide subunits.
- The nucleotide subunits found in DNA are Adenine (A), Cytosine (C), Guanine (G) and Thymine.
- According to the complementary base pairing rule by Chargaff, Adenine base is hydrogen bonded to Thymine while the Cytosine base is hydrogen bonded to Guanine. A-T, G-C etc.
- These pairing between two complementary bases makes DNA molecule double stranded. The amount of adenine bases in a DNA molecule is equal to that of thymine while the same applies to Guanine and Cytosine.
- Therefore, in a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of thymine.
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