In DNA,the substitution of a purine for a pyrimidine or a pyrimidine for a purine is called a(n)________.

Question

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The substitution of a purine (adenine or guanine) for a pyrimidine (cytosine or thymine) or vice versa is called a transversion. This is different from a transition, which is the substitution of a purine for a different purine or a pyrimidine for a different pyrimidine. Therefore, choices A, B, D, and E do not accurately describe this type of substitution.

In DNA,the Substitution of a Purine for a Pyrimidine or a Pyrimidine