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Self Assessment Answer # 6
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by Dr Jamie Love
© 2002 - 2010
Genetics Course
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Self Assessment Answer # 6
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© 2002 - 2010
There are three pyrimidines and two purines.
The pyrimidines are …
Cytosine (C)
Thymine (T)
Uracil (U)
The pyrimidines are …
Adenine (A)
Guanine (G)
And they pair …
Cytosine (C) to Guanine (G) via three hydrogen bonds
Thymine (T) to Adenine (A) via two hydrogen bonds
Uracil (U) to Adenine (A) via two hydrogen bonds
The Thymine (T) to Adenine (A) pair is only found in DNA while the Uracil (U) to Adenine (A) is only found in RNA.
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