Question

What are the nitrogen bases in the DNA molecule called? Which of them are always connected?

Answer 1

Answer:

In a DNA molecule, the two strands are connecting by hydrogen bonds between the nitrogen bases of each strand. According to the base-pairing rule, the purine adenine always pairs with the pyrimidine thymine, and the purine guanine always pairs with the pyrimidine cytosine.

Explanation:

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