Complementary base pairing explained Chargaff's findings—the fact that the number of cytosines in a DNA sample equals the number of guanines, and the number of thymines equals the number of adenines. Complementary base pairing is the formation of hydrogen bonds between antiparallel strands of the DNA molecule. Which statement regarding complementary base pairing is correct?

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Purines always pair with other purines, and pyrimidines always pair with other pyrimidines.

  

The purine base cytosine (C) always pairs with the purine base guanine (G).

  

In DNA, the purine base adenine (A) always pairs with the pyrimidine base thymine (T).

  

In DNA, the pairing of cytosine (C) with guanine (G) forms two hydrogen bonds.

 

asked Dec 25, 2012 in Biology by anonymous
    

1 Answer

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In DNA, the purine base adenine (A) always pairs with the pyrimidine base thymine (T).

 

answered Dec 25, 2012 by anonymous



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